Linux Kernel

An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen

CVE-2021-26931 5.5 - Medium - February 17, 2021

An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.

CVE-2021-26931 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Allocation of Resources Without Limits or Throttling

An issue was discovered in the Linux kernel 4.18 through 5.10.16, as used by Xen

CVE-2021-26934 7.8 - High - February 17, 2021

An issue was discovered in the Linux kernel 4.18 through 5.10.16, as used by Xen. The backend allocation (aka be-alloc) mode of the drm_xen_front drivers was not meant to be a supported configuration, but this wasn't stated accordingly in its support status entry.

CVE-2021-26934 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen

CVE-2021-26930 7.8 - High - February 17, 2021

An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later processing, resulting in the caller assuming successful mapping, and hence subsequent operations trying to access space that wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery from the error. This affects drivers/block/xen-blkback/blkback.c.

CVE-2021-26930 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Overlayfs did not properly perform permission checking when copying up files in an overlayfs and could be exploited from within a user namespace, if, for example, unprivileged user namespaces were

CVE-2020-16120 4.4 - Medium - February 10, 2021

Overlayfs did not properly perform permission checking when copying up files in an overlayfs and could be exploited from within a user namespace, if, for example, unprivileged user namespaces were allowed. It was possible to have a file not readable by an unprivileged user to be copied to a mountpoint controlled by the user, like a removable device. This was introduced in kernel version 4.19 by commit d1d04ef ("ovl: stack file ops"). This was fixed in kernel version 5.8 by commits 56230d9 ("ovl: verify permissions in ovl_path_open()"), 48bd024 ("ovl: switch to mounter creds in readdir") and 05acefb ("ovl: check permission to open real file"). Additionally, commits 130fdbc ("ovl: pass correct flags for opening real directory") and 292f902 ("ovl: call secutiry hook in ovl_real_ioctl()") in kernel 5.8 might also be desired or necessary. These additional commits introduced a regression in overlay mounts within user namespaces which prevented access to files with ownership outside of the user namespace. This regression was mitigated by subsequent commit b6650da ("ovl: do not fail because of O_NOATIMEi") in kernel 5.11.

CVE-2020-16120 is exploitable with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Improper Privilege Management

A local privilege escalation was discovered in the Linux kernel before 5.10.13

CVE-2021-26708 7 - High - February 05, 2021

A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.

CVE-2021-26708 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Improper Privilege Management

nbd_add_socket in drivers/block/nbd.c in the Linux kernel through 5.10.12 has an ndb_queue_rq use-after-free

CVE-2021-3348 7 - High - February 01, 2021

nbd_add_socket in drivers/block/nbd.c in the Linux kernel through 5.10.12 has an ndb_queue_rq use-after-free that could be triggered by local attackers (with access to the nbd device) via an I/O request at a certain point during device setup, aka CID-b98e762e3d71.

CVE-2021-3348 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Race Condition

An issue was discovered in the Linux kernel through 5.10.11

CVE-2021-3347 7.8 - High - January 29, 2021

An issue was discovered in the Linux kernel through 5.10.11. PI futexes have a kernel stack use-after-free during fault handling, allowing local users to execute code in the kernel, aka CID-34b1a1ce1458.

CVE-2021-3347 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Dangling pointer

A flaw incorrect umask during file or directory modification in the Linux kernel NFS (network file system) functionality was found in the way user create and delete object using NFSv4.2 or newer if both simultaneously accessing the NFS by the other process

CVE-2020-35513 4.9 - Medium - January 26, 2021

A flaw incorrect umask during file or directory modification in the Linux kernel NFS (network file system) functionality was found in the way user create and delete object using NFSv4.2 or newer if both simultaneously accessing the NFS by the other process that is not using new NFSv4.2. A user with access to the NFS could use this flaw to starve the resources causing denial of service.

CVE-2020-35513 can be explotited with network access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.2 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Privilege Dropping / Lowering Errors

** DISPUTED ** fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem

CVE-2021-3178 6.5 - Medium - January 19, 2021

** DISPUTED ** fs/nfsd/nfs3xdr.c in the Linux kernel through 5.10.8, when there is an NFS export of a subdirectory of a filesystem, allows remote attackers to traverse to other parts of the filesystem via READDIRPLUS. NOTE: some parties argue that such a subdirectory export is not intended to prevent this attack; see also the exports(5) no_subtree_check default behavior.

CVE-2021-3178 is exploitable with network access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.2 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Directory traversal

Use-after-free vulnerability in the Linux kernel exploitable by a local attacker due to reuse of a DCCP socket with an attached dccps_hc_tx_ccid object as a listener after being released

CVE-2020-16119 7.8 - High - January 14, 2021

Use-after-free vulnerability in the Linux kernel exploitable by a local attacker due to reuse of a DCCP socket with an attached dccps_hc_tx_ccid object as a listener after being released. Fixed in Ubuntu Linux kernel 5.4.0-51.56, 5.3.0-68.63, 4.15.0-121.123, 4.4.0-193.224, 3.13.0.182.191 and 3.2.0-149.196.

CVE-2020-16119 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Dangling pointer

In drivers/target/target_core_xcopy.c in the Linux kernel before 5.10.7, insufficient identifier checking in the LIO SCSI target code can be used by remote attackers to read or write files

CVE-2020-28374 8.1 - High - January 13, 2021

In drivers/target/target_core_xcopy.c in the Linux kernel before 5.10.7, insufficient identifier checking in the LIO SCSI target code can be used by remote attackers to read or write files via directory traversal in an XCOPY request, aka CID-2896c93811e3. For example, an attack can occur over a network if the attacker has access to one iSCSI LUN. The attacker gains control over file access because I/O operations are proxied via an attacker-selected backstore.

CVE-2020-28374 is exploitable with network access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 2.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Directory traversal

mwifiex_cmd_802_11_ad_hoc_start in drivers/net/wireless/marvell/mwifiex/join.c in the Linux kernel through 5.10.4 might

CVE-2020-36158 6.7 - Medium - January 05, 2021

mwifiex_cmd_802_11_ad_hoc_start in drivers/net/wireless/marvell/mwifiex/join.c in the Linux kernel through 5.10.4 might allow remote attackers to execute arbitrary code via a long SSID value, aka CID-5c455c5ab332.

CVE-2020-36158 is exploitable with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

buffer overrun

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x

CVE-2020-29569 8.8 - High - December 15, 2020

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.

CVE-2020-29569 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 2.0 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Unchecked Return Value

A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication

CVE-2020-27777 6.7 - Medium - December 15, 2020

A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication. On a locked down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries platform) a root like local user could use this flaw to further increase their privileges to that of a running kernel.

CVE-2020-27777 can be explotited with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

AuthZ

A use-after-free flaw was found in kernel/trace/ring_buffer.c in Linux kernel (before 5.10-rc1)

CVE-2020-27825 5.7 - Medium - December 11, 2020

A use-after-free flaw was found in kernel/trace/ring_buffer.c in Linux kernel (before 5.10-rc1). There was a race problem in trace_open and resize of cpu buffer running parallely on different cpus, may cause a denial of service problem (DOS). This flaw could even allow a local attacker with special user privilege to a kernel information leak threat.

CVE-2020-27825 can be explotited with local system access, and requires user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 0.5 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and a high impact on availability.

Race Condition

A flaw was found in the Linux kernels implementation of MIDI

CVE-2020-27786 7.8 - High - December 11, 2020

A flaw was found in the Linux kernels implementation of MIDI, where an attacker with a local account and the permissions to issue an ioctl commands to midi devices, could trigger a use-after-free. A write to this specific memory while freed and before use could cause the flow of execution to change and possibly allow for memory corruption or privilege escalation.

CVE-2020-27786 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Dangling pointer

A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13

CVE-2020-29660 4.4 - Medium - December 09, 2020

A locking inconsistency issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_io.c and drivers/tty/tty_jobctrl.c may allow a read-after-free attack against TIOCGSID, aka CID-c8bcd9c5be24.

CVE-2020-29660 is exploitable with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Improper Locking

A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13

CVE-2020-29661 7.8 - High - December 09, 2020

A locking issue was discovered in the tty subsystem of the Linux kernel through 5.9.13. drivers/tty/tty_jobctrl.c allows a use-after-free attack against TIOCSPGRP, aka CID-54ffccbf053b.

CVE-2020-29661 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Improper Locking

An issue was discovered in the Linux kernel before 5.9.3

CVE-2020-29534 7.8 - High - December 03, 2020

An issue was discovered in the Linux kernel before 5.9.3. io_uring takes a non-refcounted reference to the files_struct of the process that submitted a request, causing execve() to incorrectly optimize unshare_fd(), aka CID-0f2122045b94.

CVE-2020-29534 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

A flaw was found in the Linux kernel

CVE-2020-14351 7.8 - High - December 03, 2020

A flaw was found in the Linux kernel. A use-after-free memory flaw was found in the perf subsystem allowing a local attacker with permission to monitor perf events to corrupt memory and possibly escalate privileges. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2020-14351 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Dangling pointer

A flaw was found in the Linux kernels futex implementation

CVE-2020-14381 7.8 - High - December 03, 2020

A flaw was found in the Linux kernels futex implementation. This flaw allows a local attacker to corrupt system memory or escalate their privileges when creating a futex on a filesystem that is about to be unmounted. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CVE-2020-14381 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Dangling pointer

A flaw memory leak in the Linux kernel performance monitoring subsystem was found in the way if using PERF_EVENT_IOC_SET_FILTER

CVE-2020-25704 5.5 - Medium - December 02, 2020

A flaw memory leak in the Linux kernel performance monitoring subsystem was found in the way if using PERF_EVENT_IOC_SET_FILTER. A local user could use this flaw to starve the resources causing denial of service.

CVE-2020-25704 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Uncontrolled Resource Consumption ('Resource Exhaustion')

An out-of-bounds memory write flaw was found in how the Linux kernels Voice Over IP H.323 connection tracking functionality handled connections on ipv6 port 1720

CVE-2020-14305 8.1 - High - December 02, 2020

An out-of-bounds memory write flaw was found in how the Linux kernels Voice Over IP H.323 connection tracking functionality handled connections on ipv6 port 1720. This flaw allows an unauthenticated remote user to crash the system, causing a denial of service. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CVE-2020-14305 can be explotited with network access, and does not require authorization privledges or user interaction. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 2.2 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Out-of-bounds Write

A flaw was found in the Linux kernel

CVE-2020-25656 4.1 - Medium - December 02, 2020

A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access out of bounds. The highest threat from this vulnerability is to data confidentiality.

CVE-2020-25656 is exploitable with local system access, and requires user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 0.5 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Dangling pointer

An issue was discovered in fs/io_uring.c in the Linux kernel before 5.6

CVE-2020-29373 6.5 - Medium - November 28, 2020

An issue was discovered in fs/io_uring.c in the Linux kernel before 5.6. It unsafely handles the root directory during path lookups, and thus a process inside a mount namespace can escape to unintended filesystem locations, aka CID-ff002b30181d.

CVE-2020-29373 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 2.0 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Directory traversal

An issue was discovered in the Linux kernel before 5.7.3, related to mm/gup.c and mm/huge_memory.c

CVE-2020-29374 7 - High - November 28, 2020

An issue was discovered in the Linux kernel before 5.7.3, related to mm/gup.c and mm/huge_memory.c. The get_user_pages (aka gup) implementation, when used for a copy-on-write page, does not properly consider the semantics of read operations and therefore can grant unintended write access, aka CID-17839856fd58.

CVE-2020-29374 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

AuthZ

An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5

CVE-2020-29368 7 - High - November 28, 2020

An issue was discovered in __split_huge_pmd in mm/huge_memory.c in the Linux kernel before 5.7.5. The copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check, aka CID-c444eb564fb1.

CVE-2020-29368 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Out-of-bounds Write

An issue was discovered in mm/mmap.c in the Linux kernel before 5.7.11

CVE-2020-29369 7 - High - November 28, 2020

An issue was discovered in mm/mmap.c in the Linux kernel before 5.7.11. There is a race condition between certain expand functions (expand_downwards and expand_upwards) and page-table free operations from an munmap call, aka CID-246c320a8cfe.

CVE-2020-29369 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Race Condition

An issue was discovered in the Linux kernel before 5.2.6

CVE-2019-20934 5.3 - Medium - November 28, 2020

An issue was discovered in the Linux kernel before 5.2.6. On NUMA systems, the Linux fair scheduler has a use-after-free in show_numa_stats() because NUMA fault statistics are inappropriately freed, aka CID-16d51a590a8c.

CVE-2019-20934 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity, and a high impact on availability.

Dangling pointer

An issue was discovered in kmem_cache_alloc_bulk in mm/slub.c in the Linux kernel before 5.5.11

CVE-2020-29370 7 - High - November 28, 2020

An issue was discovered in kmem_cache_alloc_bulk in mm/slub.c in the Linux kernel before 5.5.11. The slowpath lacks the required TID increment, aka CID-fd4d9c7d0c71.

CVE-2020-29370 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Race Condition

An issue was discovered in do_madvise in mm/madvise.c in the Linux kernel before 5.6.8

CVE-2020-29372 4.7 - Medium - November 28, 2020

An issue was discovered in do_madvise in mm/madvise.c in the Linux kernel before 5.6.8. There is a race condition between coredump operations and the IORING_OP_MADVISE implementation, aka CID-bc0c4d1e176e.

CVE-2020-29372 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Race Condition

An issue was discovered in romfs_dev_read in fs/romfs/storage.c in the Linux kernel before 5.8.4

CVE-2020-29371 3.3 - Low - November 28, 2020

An issue was discovered in romfs_dev_read in fs/romfs/storage.c in the Linux kernel before 5.8.4. Uninitialized memory leaks to userspace, aka CID-bcf85fcedfdd.

CVE-2020-29371 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.

Use of Uninitialized Resource

The Linux kernel before version 5.8 is vulnerable to a NULL pointer dereference in drivers/tty/serial/8250/8250_core.c:serial8250_isa_init_ports()

CVE-2020-15437 4.4 - Medium - November 23, 2020

The Linux kernel before version 5.8 is vulnerable to a NULL pointer dereference in drivers/tty/serial/8250/8250_core.c:serial8250_isa_init_ports() that allows local users to cause a denial of service by using the p->serial_in pointer which uninitialized.

CVE-2020-15437 can be explotited with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

NULL Pointer Dereference

Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8

CVE-2020-15436 6.7 - Medium - November 23, 2020

Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain privileges or cause a denial of service by leveraging improper access to a certain error field.

CVE-2020-15436 is exploitable with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Dangling pointer

Improper input validation in BlueZ may

CVE-2020-12351 8.8 - High - November 23, 2020

Improper input validation in BlueZ may allow an unauthenticated user to potentially enable escalation of privilege via adjacent access.

Improper Input Validation

A slab-out-of-bounds read in fbcon in the Linux kernel before 5.9.7 could be used by local attackers to read privileged information or potentially crash the kernel

CVE-2020-28974 5 - Medium - November 20, 2020

A slab-out-of-bounds read in fbcon in the Linux kernel before 5.9.7 could be used by local attackers to read privileged information or potentially crash the kernel, aka CID-3c4e0dff2095. This occurs because KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for manipulations such as font height.

CVE-2020-28974 is exploitable with physical access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.3 out of four. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and a high impact on availability.

Out-of-bounds Read

An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9

CVE-2020-28941 5.5 - Medium - November 19, 2020

An issue was discovered in drivers/accessibility/speakup/spk_ttyio.c in the Linux kernel through 5.9.9. Local attackers on systems with the speakup driver could cause a local denial of service attack, aka CID-d41227544427. This occurs because of an invalid free when the line discipline is used more than once.

CVE-2020-28941 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Release of Invalid Pointer or Reference

A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be used by local attackers to read kernel memory

CVE-2020-28915 5.8 - Medium - November 18, 2020

A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be used by local attackers to read kernel memory, aka CID-6735b4632def.

CVE-2020-28915 can be explotited with physical access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.3 out of four. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a high impact on integrity and availability.

Out-of-bounds Read

A flaw in the way reply ICMP packets are limited in the Linux kernel functionality was found that allows to quickly scan open UDP ports

CVE-2020-25705 7.4 - High - November 17, 2020

A flaw in the way reply ICMP packets are limited in the Linux kernel functionality was found that allows to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypassing source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well. Kernel versions before 5.10 may be vulnerable to this issue.

CVE-2020-25705 can be explotited with network access, and does not require authorization privledges or user interaction. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 2.2 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Use of Insufficiently Random Values

An issue was discovered in ioapic_lazy_update_eoi in arch/x86/kvm/ioapic.c in the Linux kernel before 5.9.2

CVE-2020-27152 5.5 - Medium - November 06, 2020

An issue was discovered in ioapic_lazy_update_eoi in arch/x86/kvm/ioapic.c in the Linux kernel before 5.9.2. It has an infinite loop related to improper interaction between a resampler and edge triggering, aka CID-77377064c3a9.

CVE-2020-27152 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Loop with Unreachable Exit Condition ('Infinite Loop')

An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x

CVE-2020-27673 5.5 - Medium - October 22, 2020

An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. Guest OS users can cause a denial of service (host OS hang) via a high rate of events to dom0, aka CID-e99502f76271.

CVE-2020-27673 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Uncontrolled Resource Consumption ('Resource Exhaustion')

An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x

CVE-2020-27675 4.7 - Medium - October 22, 2020

An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5.

CVE-2020-27675 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Race Condition

An issue was discovered in the Linux kernel before 5.8.15

CVE-2020-27194 5.5 - Medium - October 16, 2020

An issue was discovered in the Linux kernel before 5.8.15. scalar32_min_max_or in kernel/bpf/verifier.c mishandles bounds tracking during use of 64-bit values, aka CID-5b9fbeb75b6a.

CVE-2020-27194 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Memory Corruption

A flaw was found in the Linux kernel in versions before 5.9-rc7

CVE-2020-25645 7.5 - High - October 13, 2020

A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

CVE-2020-25645 can be explotited with network access, and does not require authorization privledges or user interaction. This vulnerability is considered to have a low attack complexity. It has the highest possible exploitability rating (3.9). The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Cleartext Transmission of Sensitive Information

A flaw was found in the HDLC_PPP module of the Linux kernel in versions before 5.9-rc7

CVE-2020-25643 7.2 - High - October 06, 2020

A flaw was found in the HDLC_PPP module of the Linux kernel in versions before 5.9-rc7. Memory corruption and a read overflow is caused by improper input validation in the ppp_cp_parse_cr function which can cause the system to crash or cause a denial of service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2020-25643 can be explotited with network access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.2 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Improper Input Validation

A flaw was found in the Linux kernel's implementation of biovecs in versions before 5.9-rc7

CVE-2020-25641 5.5 - Medium - October 06, 2020

A flaw was found in the Linux kernel's implementation of biovecs in versions before 5.9-rc7. A zero-length biovec request issued by the block subsystem could cause the kernel to enter an infinite loop, causing a denial of service. This flaw allows a local attacker with basic privileges to issue requests to a block device, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

CVE-2020-25641 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Loop with Unreachable Exit Condition ('Infinite Loop')

The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism

CVE-2020-26541 6.5 - Medium - October 02, 2020

The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. This affects certs/blacklist.c and certs/system_keyring.c.

CVE-2020-26541 can be explotited with local system access, requires user interaction and user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.6 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

A missing CAP_NET_RAW check in NFC socket creation in net/nfc/rawsock.c in the Linux kernel before 5.8.2 could be used by local attackers to create raw sockets

CVE-2020-26088 5.5 - Medium - September 24, 2020

A missing CAP_NET_RAW check in NFC socket creation in net/nfc/rawsock.c in the Linux kernel before 5.8.2 could be used by local attackers to create raw sockets, bypassing security mechanisms, aka CID-26896f01467a.

CVE-2020-26088 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.

Incorrect Default Permissions

A flaw was found in the Linux kernel in versions before 5.9-rc6

CVE-2020-14390 5.6 - Medium - September 18, 2020

A flaw was found in the Linux kernel in versions before 5.9-rc6. When changing screen size, an out-of-bounds memory write can occur leading to memory corruption or a denial of service. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.

CVE-2020-14390 is exploitable with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and a high impact on availability.

Out-of-bounds Write

A flaw was found in the Linux kernel before 5.9-rc4

CVE-2020-14386 7.8 - High - September 16, 2020

A flaw was found in the Linux kernel before 5.9-rc4. Memory corruption can be exploited to gain root privileges from unprivileged processes. The highest threat from this vulnerability is to data confidentiality and integrity.

CVE-2020-14386 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Out-of-bounds Write

A flaw was found in the Linux Kernel before 5.8-rc6 in the ZRAM kernel module, where a user with a local account and the ability to read the /sys/class/zram-control/hot_add file

CVE-2020-10781 5.5 - Medium - September 16, 2020

A flaw was found in the Linux Kernel before 5.8-rc6 in the ZRAM kernel module, where a user with a local account and the ability to read the /sys/class/zram-control/hot_add file can create ZRAM device nodes in the /dev/ directory. This read allocates kernel memory and is not accounted for a user that triggers the creation of that ZRAM device. With this vulnerability, continually reading the device may consume a large amount of system memory and cause the Out-of-Memory (OOM) killer to activate and terminate random userspace processes, possibly making the system inoperable.

CVE-2020-10781 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Uncontrolled Resource Consumption ('Resource Exhaustion')

A flaw was found in the Linux Kernel before 5.8-rc1 in the prctl() function, where it

CVE-2020-10768 5.5 - Medium - September 16, 2020

A flaw was found in the Linux Kernel before 5.8-rc1 in the prctl() function, where it can be used to enable indirect branch speculation after it has been disabled. This call incorrectly reports it as being 'force disabled' when it is not and opens the system to Spectre v2 attacks. The highest threat from this vulnerability is to confidentiality.

CVE-2020-10768 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

A logic bug flaw was found in Linux kernel before 5.8-rc1 in the implementation of SSBD

CVE-2020-10766 5.5 - Medium - September 15, 2020

A logic bug flaw was found in Linux kernel before 5.8-rc1 in the implementation of SSBD. A bug in the logic handling allows an attacker with a local account to disable SSBD protection during a context switch when additional speculative execution mitigations are in place. This issue was introduced when the per task/process conditional STIPB switching was added on top of the existing SSBD switching. The highest threat from this vulnerability is to confidentiality.

CVE-2020-10766 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

A flaw was found in the Linux kernel before 5.8-rc1 in the implementation of the Enhanced IBPB (Indirect Branch Prediction Barrier)

CVE-2020-10767 5.5 - Medium - September 15, 2020

A flaw was found in the Linux kernel before 5.8-rc1 in the implementation of the Enhanced IBPB (Indirect Branch Prediction Barrier). The IBPB mitigation will be disabled when STIBP is not available or when the Enhanced Indirect Branch Restricted Speculation (IBRS) is available. This flaw allows a local attacker to perform a Spectre V2 style attack when this configuration is active. The highest threat from this vulnerability is to confidentiality.

CVE-2020-10767 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

A flaw was found in the Linux kernel before 5.9-rc4

CVE-2020-14385 5.5 - Medium - September 15, 2020

A flaw was found in the Linux kernel before 5.9-rc4. A failure of the file system metadata validator in XFS can cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt. This can lead to the filesystem being shutdown, or otherwise rendered inaccessible until it is remounted, leading to a denial of service. The highest threat from this vulnerability is to system availability.

CVE-2020-14385 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Incorrect Calculation of Buffer Size

A memory out-of-bounds read flaw was found in the Linux kernel before 5.9-rc2 with the ext3/ext4 file system

CVE-2020-14314 5.5 - Medium - September 15, 2020

A memory out-of-bounds read flaw was found in the Linux kernel before 5.9-rc2 with the ext3/ext4 file system, in the way it accesses a directory with broken indexing. This flaw allows a local user to crash the system if the directory exists. The highest threat from this vulnerability is to system availability.

CVE-2020-14314 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Out-of-bounds Read

A flaw was found in the Linux kernels implementation of the invert video code on VGA consoles when a local attacker attempts to resize the console, calling an ioctl VT_RESIZE

CVE-2020-14331 6.6 - Medium - September 15, 2020

A flaw was found in the Linux kernels implementation of the invert video code on VGA consoles when a local attacker attempts to resize the console, calling an ioctl VT_RESIZE, which causes an out-of-bounds write to occur. This flaw allows a local user with access to the VGA console to crash the system, potentially escalating their privileges on the system. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2020-14331 can be explotited with physical access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.7 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Out-of-bounds Write

A race condition between hugetlb sysctl handlers in mm/hugetlb.c in the Linux kernel before 5.8.8 could be used by local attackers to corrupt memory

CVE-2020-25285 6.4 - Medium - September 13, 2020

A race condition between hugetlb sysctl handlers in mm/hugetlb.c in the Linux kernel before 5.8.8 could be used by local attackers to corrupt memory, cause a NULL pointer dereference, or possibly have unspecified other impact, aka CID-17743798d812.

CVE-2020-25285 can be explotited with local system access, and requires user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 0.5 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Race Condition

The rbd block device driver in drivers/block/rbd.c in the Linux kernel through 5.8.9 used incomplete permission checking for access to rbd devices

CVE-2020-25284 4.1 - Medium - September 13, 2020

The rbd block device driver in drivers/block/rbd.c in the Linux kernel through 5.8.9 used incomplete permission checking for access to rbd devices, which could be leveraged by local attackers to map or unmap rbd block devices, aka CID-f44d04e696fe.

CVE-2020-25284 is exploitable with local system access, and requires user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 0.5 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.

Incorrect Permission Assignment for Critical Resource

get_gate_page in mm/gup.c in the Linux kernel 5.7.x and 5.8.x before 5.8.7 allows privilege escalation because of incorrect reference counting (caused by gate page mishandling) of the struct page

CVE-2020-25221 7.8 - High - September 10, 2020

get_gate_page in mm/gup.c in the Linux kernel 5.7.x and 5.8.x before 5.8.7 allows privilege escalation because of incorrect reference counting (caused by gate page mishandling) of the struct page that backs the vsyscall page. The result is a refcount underflow. This can be triggered by any 64-bit process that can use ptrace() or process_vm_readv(), aka CID-9fa2dd946743.

CVE-2020-25221 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Operation on a Resource after Expiration or Release

The Linux kernel 4.9.x before 4.9.233, 4.14.x before 4.14.194, and 4.19.x before 4.19.140 has a use-after-free

CVE-2020-25220 7.8 - High - September 10, 2020

The Linux kernel 4.9.x before 4.9.233, 4.14.x before 4.14.194, and 4.19.x before 4.19.140 has a use-after-free because skcd->no_refcnt was not considered during a backport of a CVE-2020-14356 patch. This is related to the cgroups feature.

CVE-2020-25220 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Dangling pointer

In the Linux kernel through 5.8.7

CVE-2020-25211 6 - Medium - September 09, 2020

In the Linux kernel through 5.8.7, local attackers able to inject conntrack netlink configuration could overflow a local buffer, causing crashes or triggering use of incorrect protocol numbers in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c, aka CID-1cc5ef91d2ff.

CVE-2020-25211 can be explotited with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity and availability.

buffer overrun

A TOCTOU mismatch in the NFS client code in the Linux kernel before 5.8.3 could be used by local attackers to corrupt memory or possibly have unspecified other impact

CVE-2020-25212 7 - High - September 09, 2020

A TOCTOU mismatch in the NFS client code in the Linux kernel before 5.8.3 could be used by local attackers to corrupt memory or possibly have unspecified other impact because a size check is in fs/nfs/nfs4proc.c instead of fs/nfs/nfs4xdr.c, aka CID-b4487b935452.

CVE-2020-25212 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

TOCTTOU

A flaw was found in the Linux kernel's implementation of some networking protocols in IPsec, such as VXLAN and GENEVE tunnels over IPv6

CVE-2020-1749 7.5 - High - September 09, 2020

A flaw was found in the Linux kernel's implementation of some networking protocols in IPsec, such as VXLAN and GENEVE tunnels over IPv6. When an encrypted tunnel is created between two hosts, the kernel isn't correctly routing tunneled data over the encrypted link; rather sending the data unencrypted. This would allow anyone in between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

CVE-2020-1749 can be explotited with network access, and does not require authorization privledges or user interaction. This vulnerability is considered to have a low attack complexity. It has the highest possible exploitability rating (3.9). The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Cleartext Transmission of Sensitive Information

A flaw was found in the Linux kernel's implementation of GRO in versions before 5.2

CVE-2020-10720 5.5 - Medium - September 03, 2020

A flaw was found in the Linux kernel's implementation of GRO in versions before 5.2. This flaw allows an attacker with local access to crash the system.

CVE-2020-10720 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Dangling pointer

A flaw null pointer dereference in the Linux kernel cgroupv2 subsystem in versions before 5.7.10 was found in the way when reboot the system

CVE-2020-14356 7.8 - High - August 19, 2020

A flaw null pointer dereference in the Linux kernel cgroupv2 subsystem in versions before 5.7.10 was found in the way when reboot the system. A local user could use this flaw to crash the system or escalate their privileges on the system.

CVE-2020-14356 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

NULL Pointer Dereference

In the Linux kernel before 5.7.8, fs/nfsd/vfs.c (in the NFS server)

CVE-2020-24394 7.1 - High - August 19, 2020

In the Linux kernel before 5.7.8, fs/nfsd/vfs.c (in the NFS server) can set incorrect permissions on new filesystem objects when the filesystem lacks ACL support, aka CID-22cf8419f131. This occurs because the current umask is not considered.

CVE-2020-24394 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Incorrect Permission Assignment for Critical Resource

The Linux kernel through 5.7.11 allows remote attackers to make observations

CVE-2020-16166 3.7 - Low - July 30, 2020

The Linux kernel through 5.7.11 allows remote attackers to make observations that help to obtain sensitive information about the internal state of the network RNG, aka CID-f227e3ec3b5c. This is related to drivers/char/random.c and kernel/time/timer.c.

CVE-2020-16166 is exploitable with network access, and does not require authorization privledges or user interaction. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 2.2 out of four. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.

Information Leak

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests

CVE-2020-15852 7.8 - High - July 20, 2020

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tss_invalidate_io_bitmap mishandling causes a loss of synchronization between the I/O bitmaps of TSS and Xen, aka CID-cadfad870154.

CVE-2020-15852 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Incorrect Default Permissions

An issue was discovered in drivers/acpi/acpi_configfs.c in the Linux kernel before 5.7.7

CVE-2020-15780 6.7 - Medium - July 15, 2020

An issue was discovered in drivers/acpi/acpi_configfs.c in the Linux kernel before 5.7.7. Injection of malicious ACPI tables via configfs could be used by attackers to bypass lockdown and secure boot restrictions, aka CID-75b0cea7bf30.

CVE-2020-15780 is exploitable with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

AuthZ

An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4

CVE-2019-20908 6.7 - Medium - July 15, 2020

An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.

CVE-2019-20908 is exploitable with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Improper Privilege Management

A flaw was found in the fix for CVE-2019-11135

CVE-2019-19338 5.5 - Medium - July 13, 2020

A flaw was found in the fix for CVE-2019-11135, in the Linux upstream kernel versions before 5.5 where, the way Intel CPUs handle speculative execution of instructions when a TSX Asynchronous Abort (TAA) error occurs. When a guest is running on a host CPU affected by the TAA flaw (TAA_NO=0), but is not affected by the MDS issue (MDS_NO=1), the guest was to clear the affected buffers by using a VERW instruction mechanism. But when the MDS_NO=1 bit was exported to the guests, the guests did not use the VERW mechanism to clear the affected buffers. This issue affects guests running on Cascade Lake CPUs and requires that host has 'TSX' enabled. Confidentiality of data is the highest threat associated with this vulnerability.

CVE-2019-19338 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.

Information Exposure Through Discrepancy

In the Linux kernel 4.4 through 5.7.6

CVE-2020-15393 5.5 - Medium - June 29, 2020

In the Linux kernel 4.4 through 5.7.6, usbtest_disconnect in drivers/usb/misc/usbtest.c has a memory leak, aka CID-28ebeb8db770.

CVE-2020-15393 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Missing Release of Resource after Effective Lifetime

In the Linux kernel before 5.4.16, a race condition in tty->disc_data handling in the slip and sl

CVE-2020-14416 4.2 - Medium - June 18, 2020

In the Linux kernel before 5.4.16, a race condition in tty->disc_data handling in the slip and slcan line discipline could lead to a use-after-free, aka CID-0ace17d56824. This affects drivers/net/slip/slip.c and drivers/net/can/slcan.c.

CVE-2020-14416 is exploitable with local system access, requires user interaction and user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.6 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Dangling pointer

A flaw was found in the Linux kernel's implementation of Userspace core dumps

CVE-2020-10732 4.4 - Medium - June 12, 2020

A flaw was found in the Linux kernel's implementation of Userspace core dumps. This flaw allows an attacker with a local account to crash a trivial program and exfiltrate private kernel data.

CVE-2020-10732 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity, and a small impact on availability.

Information Leak

A flaw was found in the Linux Kernel in versions after 4.5-rc1 in the way mremap handled DAX Huge Pages

CVE-2020-10757 7.8 - High - June 09, 2020

A flaw was found in the Linux Kernel in versions after 4.5-rc1 in the way mremap handled DAX Huge Pages. This flaw allows a local attacker with access to a DAX enabled storage to escalate their privileges on the system.

CVE-2020-10757 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Improper Privilege Management

An issue was discovered in the Linux kernel 4.4 through 5.7.1

CVE-2020-13974 7.8 - High - June 09, 2020

An issue was discovered in the Linux kernel 4.4 through 5.7.1. drivers/tty/vt/keyboard.c has an integer overflow if k_ascii is called several times in a row, aka CID-b86dab054059. NOTE: Members in the community argue that the integer overflow does not lead to a security issue in this case.

CVE-2020-13974 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Integer Overflow or Wraparound

An issue was discovered in the Linux kernel before 5.0.6

CVE-2019-20811 5.5 - Medium - June 03, 2020

An issue was discovered in the Linux kernel before 5.0.6. In rx_queue_add_kobject() and netdev_queue_add_kobject() in net/core/net-sysfs.c, a reference count is mishandled, aka CID-a3e23f719f5c.

CVE-2019-20811 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.

An issue was discovered in the Linux kernel before 5.4.7

CVE-2019-20812 5.5 - Medium - June 03, 2020

An issue was discovered in the Linux kernel before 5.4.7. The prb_calc_retire_blk_tmo() function in net/packet/af_packet.c can result in a denial of service (CPU consumption and soft lockup) in a certain failure case involving TPACKET_V3, aka CID-b43d1f9f7067.

CVE-2019-20812 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Uncontrolled Resource Consumption ('Resource Exhaustion')

go7007_snd_init in drivers/media/usb/go7007/snd-go7007.c in the Linux kernel before 5.6 does not call snd_card_free for a failure path

CVE-2019-20810 5.5 - Medium - June 03, 2020

go7007_snd_init in drivers/media/usb/go7007/snd-go7007.c in the Linux kernel before 5.6 does not call snd_card_free for a failure path, which causes a memory leak, aka CID-9453264ef586.

CVE-2019-20810 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Missing Release of Resource after Effective Lifetime

An issue was discovered in the Linux kernel before 5.2

CVE-2019-20806 4.4 - Medium - May 27, 2020

An issue was discovered in the Linux kernel before 5.2. There is a NULL pointer dereference in tw5864_handle_frame() in drivers/media/pci/tw5864/tw5864-video.c, which may cause denial of service, aka CID-2e7682ebfc75.

CVE-2019-20806 is exploitable with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

NULL Pointer Dereference

A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7

CVE-2020-10711 5.9 - Medium - May 22, 2020

A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.

CVE-2020-10711 can be explotited with network access, and does not require authorization privledges or user interaction. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 2.2 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

NULL Pointer Dereference

gadget_dev_desc_UDC_store in drivers/usb/gadget/configfs.c in the Linux kernel 3.16 through 5.6.13 relies on kstrdup without considering the possibility of an internal '\0' value, which

CVE-2020-13143 6.5 - Medium - May 18, 2020

gadget_dev_desc_UDC_store in drivers/usb/gadget/configfs.c in the Linux kernel 3.16 through 5.6.13 relies on kstrdup without considering the possibility of an internal '\0' value, which allows attackers to trigger an out-of-bounds read, aka CID-15753588bcd4.

CVE-2020-13143 can be explotited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 2.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Out-of-bounds Read

The VFIO PCI driver in the Linux kernel through 5.6.13 mishandles attempts to access disabled memory space.

CVE-2020-12888 5.3 - Medium - May 15, 2020

The VFIO PCI driver in the Linux kernel through 5.6.13 mishandles attempts to access disabled memory space.

CVE-2020-12888 is exploitable with local system access, and requires user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Improper Handling of Exceptional Conditions

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2

CVE-2020-12826 5.3 - Medium - May 12, 2020

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.

CVE-2020-12826 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.

Integer Overflow or Wraparound

An issue was discovered in the Linux kernel before 5.4.17

CVE-2020-12769 5.5 - Medium - May 09, 2020

An issue was discovered in the Linux kernel before 5.4.17. drivers/spi/spi-dw.c allows attackers to cause a panic via concurrent calls to dw_spi_irq and dw_spi_transfer_one, aka CID-19b61392c5a8.

CVE-2020-12769 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Improper Input Validation

** DISPUTED ** An issue was discovered in the Linux kernel before 5.6

CVE-2020-12768 5.5 - Medium - May 09, 2020

** DISPUTED ** An issue was discovered in the Linux kernel before 5.6. svm_cpu_uninit in arch/x86/kvm/svm.c has a memory leak, aka CID-d80b64ff297e. NOTE: third parties dispute this issue because it's a one-time leak at the boot, the size is negligible, and it can't be triggered at will.

CVE-2020-12768 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Missing Release of Resource after Effective Lifetime

An issue was discovered in the Linux kernel through 5.6.11

CVE-2020-12770 6.7 - Medium - May 09, 2020

An issue was discovered in the Linux kernel through 5.6.11. sg_write lacks an sg_remove_request call in a certain failure case, aka CID-83c6f2390040.

CVE-2020-12770 is exploitable with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

An issue was discovered in the Linux kernel through 5.6.11

CVE-2020-12771 5.5 - Medium - May 09, 2020

An issue was discovered in the Linux kernel through 5.6.11. btree_gc_coalesce in drivers/md/bcache/btree.c has a deadlock if a coalescing operation fails.

CVE-2020-12771 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Improper Input Validation

An issue was discovered in the Linux kernel 4.18 through 5.6.11 when unprivileged user namespaces are allowed

CVE-2019-20794 4.7 - Medium - May 09, 2020

An issue was discovered in the Linux kernel 4.18 through 5.6.11 when unprivileged user namespaces are allowed. A user can create their own PID namespace, and mount a FUSE filesystem. Upon interaction with this FUSE filesystem, if the userspace component is terminated via a kill of the PID namespace's pid 1, it will result in a hung task, and resources being permanently locked up until system reboot. This can result in resource exhaustion.

CVE-2019-20794 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Uncontrolled Resource Consumption ('Resource Exhaustion')

There is a use-after-free in kernel versions before 5.5 due to a race condition between the release of ptp_clock and cdev while resource deallocation

CVE-2020-10690 6.4 - Medium - May 08, 2020

There is a use-after-free in kernel versions before 5.5 due to a race condition between the release of ptp_clock and cdev while resource deallocation. When a (high privileged) process allocates a ptp device file (like /dev/ptpX) and voluntarily goes to sleep. During this time if the underlying device is removed, it can cause an exploitable condition as the process wakes up to terminate and clean all attached files. The system crashes due to the cdev structure being invalid (as already freed) which is pointed to by the inode.

CVE-2020-10690 is exploitable with local system access, and requires user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 0.5 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Dangling pointer

The fix for CVE-2019-11599, affecting the Linux kernel before 5.0.10 was not complete

CVE-2019-14898 7 - High - May 08, 2020

The fix for CVE-2019-11599, affecting the Linux kernel before 5.0.10 was not complete. A local user could use this flaw to obtain sensitive information, cause a denial of service, or possibly have other unspecified impacts by triggering a race condition with mmget_not_zero or get_task_mm calls.

CVE-2019-14898 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Improper Locking

An issue was discovered in the Linux kernel before 5.6.7

CVE-2020-12659 6.7 - Medium - May 05, 2020

An issue was discovered in the Linux kernel before 5.6.7. xdp_umem_reg in net/xdp/xdp_umem.c has an out-of-bounds write (by a user with the CAP_NET_ADMIN capability) because of a lack of headroom validation.

CVE-2020-12659 can be explotited with local system access, and requires user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 0.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Out-of-bounds Write

An issue was discovered in the Linux kernel before 5.6.5

CVE-2020-12657 7.8 - High - May 05, 2020

An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.

CVE-2020-12657 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Dangling pointer

** DISPUTED ** gss_mech_free in net/sunrpc/auth_gss/gss_mech_switch.c in the rpcsec_gss_krb5 implementation in the Linux kernel through 5.6.10 lacks certain domain_release calls

CVE-2020-12656 5.5 - Medium - May 05, 2020

** DISPUTED ** gss_mech_free in net/sunrpc/auth_gss/gss_mech_switch.c in the rpcsec_gss_krb5 implementation in the Linux kernel through 5.6.10 lacks certain domain_release calls, leading to a memory leak. Note: This was disputed with the assertion that the issue does not grant any access not already available. It is a problem that on unloading a specific kernel module some memory is leaked, but loading kernel modules is a privileged operation. A user could also write a kernel module to consume any amount of memory they like and load that replicating the effect of this bug.

CVE-2020-12656 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Missing Release of Resource after Effective Lifetime

An issue was found in Linux kernel before 5.5.4

CVE-2020-12653 7.8 - High - May 05, 2020

An issue was found in Linux kernel before 5.5.4. The mwifiex_cmd_append_vsie_tlv() function in drivers/net/wireless/marvell/mwifiex/scan.c allows local users to gain privileges or cause a denial of service because of an incorrect memcpy and buffer overflow, aka CID-b70261a288ea.

CVE-2020-12653 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to be very high.

Improper Privilege Management

An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10

CVE-2020-12655 5.5 - Medium - May 05, 2020

An issue was discovered in xfs_agf_verify in fs/xfs/libxfs/xfs_alloc.c in the Linux kernel through 5.6.10. Attackers may trigger a sync of excessive duration via an XFS v5 image with crafted metadata, aka CID-d0c7feaf8767.

CVE-2020-12655 can be explotited with local system access, and requires small amount of user privledges. This vulnerability is considered to have a low attack complexity. It has an exploitability score of 1.8 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Uncontrolled Resource Consumption ('Resource Exhaustion')

The __mptctl_ioctl function in drivers/message/fusion/mptctl.c in the Linux kernel before 5.4.14

CVE-2020-12652 4.1 - Medium - May 05, 2020

The __mptctl_ioctl function in drivers/message/fusion/mptctl.c in the Linux kernel before 5.4.14 allows local users to hold an incorrect lock during the ioctl operation and trigger a race condition, i.e., a "double fetch" vulnerability, aka CID-28d76df18f0a. NOTE: the vendor states "The security impact of this bug is not as bad as it could have been because these operations are all privileged and root already has enormous destructive power."

CVE-2020-12652 is exploitable with local system access, and requires user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 0.5 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Race Condition

An issue was found in Linux kernel before 5.5.4

CVE-2020-12654 7.1 - High - May 05, 2020

An issue was found in Linux kernel before 5.5.4. mwifiex_ret_wmm_get_status() in drivers/net/wireless/marvell/mwifiex/wmm.c allows a remote AP to trigger a heap-based buffer overflow because of an incorrect memcpy, aka CID-3a9b153c5591.

Out-of-bounds Write

A pivot_root race condition in fs/namespace.c in the Linux kernel 4.4.x before 4.4.221, 4.9.x before 4.9.221, 4.14.x before 4.14.178, 4.19.x before 4.19.119, and 5.x before 5.3

CVE-2020-12114 4.7 - Medium - May 04, 2020

A pivot_root race condition in fs/namespace.c in the Linux kernel 4.4.x before 4.4.221, 4.9.x before 4.9.221, 4.14.x before 4.14.178, 4.19.x before 4.19.119, and 5.x before 5.3 allows local users to cause a denial of service (panic) by corrupting a mountpoint reference counter.

CVE-2020-12114 is exploitable with local system access, and requires small amount of user privledges. This vulnerability is consided to have a high level of attack complexity. It has an exploitability score of 1.0 out of four. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Race Condition