QEMU QEMU QEMU is a generic and open source machine emulator and virtualizer.

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By the Year

In 2024 there have been 3 vulnerabilities in QEMU with an average score of 5.8 out of ten. Last year QEMU had 16 security vulnerabilities published. Right now, QEMU is on track to have less security vulnerabilities in 2024 than it did last year. Last year, the average CVE base score was greater by 1.19

Year Vulnerabilities Average Score
2024 3 5.77
2023 16 6.96
2022 32 6.68
2021 26 6.07
2020 43 4.90
2019 16 6.98
2018 32 7.05

It may take a day or so for new QEMU vulnerabilities to show up in the stats or in the list of recent security vulnerabilties. Additionally vulnerabilities may be tagged under a different product or component name.

Recent QEMU Security Vulnerabilities

A flaw was found in QEMU

CVE-2024-3567 5.5 - Medium - April 10, 2024

A flaw was found in QEMU. An assertion failure was present in the update_sctp_checksum() function in hw/net/net_tx_pkt.c when trying to calculate the checksum of a short-sized fragmented packet. This flaw allows a malicious guest to crash QEMU and cause a denial of service condition.

assertion failure

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages

CVE-2023-6683 6.5 - Medium - January 12, 2024

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. The qemu_clipboard_request() function can be reached before vnc_server_cut_text_caps() was called and had the chance to initialize the clipboard peer, leading to a NULL pointer dereference. This could allow a malicious authenticated VNC client to crash QEMU and trigger a denial of service.

NULL Pointer Dereference

A stack based buffer overflow was found in the virtio-net device of QEMU

CVE-2023-6693 5.3 - Medium - January 02, 2024

A stack based buffer overflow was found in the virtio-net device of QEMU. This issue occurs when flushing TX in the virtio_net_flush_tx function if guest features VIRTIO_NET_F_HASH_REPORT, VIRTIO_F_VERSION_1 and VIRTIO_NET_F_MRG_RXBUF are enabled. This could allow a malicious user to overwrite local variables allocated on the stack. Specifically, the `out_sg` variable could be used to read a part of process memory and send it to the wire, causing an information leak.

Memory Corruption

A flaw was found in the 9p passthrough filesystem (9pfs) implementation in QEMU

CVE-2023-2861 7.1 - High - December 06, 2023

A flaw was found in the 9p passthrough filesystem (9pfs) implementation in QEMU. The 9pfs server did not prohibit opening special files on the host side, potentially allowing a malicious client to escape from the exported 9p tree by creating and opening a device file in the shared folder.

A bug in QEMU could cause a guest I/O operation otherwise addressed to an arbitrary disk offset to be targeted to offset 0 instead (potentially overwriting the VM's boot code)

CVE-2023-5088 7 - High - November 03, 2023

A bug in QEMU could cause a guest I/O operation otherwise addressed to an arbitrary disk offset to be targeted to offset 0 instead (potentially overwriting the VM's boot code). This could be used, for example, by L2 guests with a virtual disk (vdiskL2) stored on a virtual disk of an L1 (vdiskL1) hypervisor to read and/or write data to LBA 0 of vdiskL1, potentially gaining control of L1 at its next reboot.

Improper Synchronization

This CVE exists because of an incomplete fix for CVE-2021-3750

CVE-2023-2680 8.2 - High - September 13, 2023

This CVE exists because of an incomplete fix for CVE-2021-3750. More specifically, the qemu-kvm package as released for Red Hat Enterprise Linux 9.1 via RHSA-2022:7967 included a version of qemu-kvm that was actually missing the fix for CVE-2021-3750.

Dangling pointer

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages

CVE-2023-3255 6.5 - Medium - September 13, 2023

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to trigger a denial of service.

Infinite Loop

A flaw was found in QEMU

CVE-2023-3301 5.6 - Medium - September 13, 2023

A flaw was found in QEMU. The async nature of hot-unplug enables a race scenario where the net device backend is cleared before the virtio-net pci frontend has been unplugged. A malicious guest could use this time window to trigger an assertion and cause a denial of service.

Race Condition

QEMU through 8.0.0 could trigger a division by zero in scsi_disk_reset in hw/scsi/scsi-disk.c

CVE-2023-42467 5.5 - Medium - September 11, 2023

QEMU through 8.0.0 could trigger a division by zero in scsi_disk_reset in hw/scsi/scsi-disk.c because scsi_disk_emulate_mode_select does not prevent s->qdev.blocksize from being 256. This stops QEMU and the guest immediately.

Divide By Zero

An issue was discovered in TCG Accelerator in QEMU 4.2.0, allows local attackers to execute arbitrary code, escalate privileges

CVE-2020-24165 8.8 - High - August 28, 2023

An issue was discovered in TCG Accelerator in QEMU 4.2.0, allows local attackers to execute arbitrary code, escalate privileges, and cause a denial of service (DoS). Note: This is disputed as a bug and not a valid security issue by multiple third parties.

The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier

CVE-2022-36648 10 - Critical - August 22, 2023

The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier, allows remote attackers to crash the host qemu and potentially execute code on the host via execute a malformed program in the guest OS. Note: This has been disputed by multiple third parties as not a valid vulnerability due to the rocker device not falling within the virtualization use case.

NULL Pointer Dereference

QEMU through 8.0.4 accesses a NULL pointer in nvme_directive_receive in hw/nvme/ctrl.c

CVE-2023-40360 5.5 - Medium - August 14, 2023

QEMU through 8.0.4 accesses a NULL pointer in nvme_directive_receive in hw/nvme/ctrl.c because there is no check for whether an endurance group is configured before checking whether Flexible Data Placement is enabled.

NULL Pointer Dereference

A heap out-of-bounds memory read flaw was found in the virtual nvme device in QEMU

CVE-2023-4135 6.5 - Medium - August 04, 2023

A heap out-of-bounds memory read flaw was found in the virtual nvme device in QEMU. The QEMU process does not validate an offset provided by the guest before computing a host heap pointer, which is used for copying data back to the guest. Arbitrary heap memory relative to an allocated buffer can be disclosed.

Out-of-bounds Read

A flaw was found in the QEMU virtual crypto device while handling data encryption/decryption requests in virtio_crypto_handle_sym_req

CVE-2023-3180 6.5 - Medium - August 03, 2023

A flaw was found in the QEMU virtual crypto device while handling data encryption/decryption requests in virtio_crypto_handle_sym_req. There is no check for the value of `src_len` and `dst_len` in virtio_crypto_sym_op_helper, potentially leading to a heap buffer overflow when the two values differ.

Memory Corruption

A DMA reentrancy issue leading to a use-after-free error was found in the e1000e NIC emulation code in QEMU

CVE-2023-3019 6.5 - Medium - July 24, 2023

A DMA reentrancy issue leading to a use-after-free error was found in the e1000e NIC emulation code in QEMU. This issue could allow a privileged guest user to crash the QEMU process on the host, resulting in a denial of service.

Dangling pointer

A flaw was found in the 9p passthrough filesystem (9pfs) implementation in QEMU

CVE-2023-1386 7.8 - High - July 24, 2023

A flaw was found in the 9p passthrough filesystem (9pfs) implementation in QEMU. When a local user in the guest writes an executable file with SUID or SGID, none of these privileged bits are correctly dropped. As a result, in rare circumstances, this flaw could be used by malicious users in the guest to elevate their privileges within the guest and help a host local user to elevate privileges on the host.

Improper Preservation of Permissions

A flaw was found in the QEMU built-in VNC server

CVE-2023-3354 7.5 - High - July 11, 2023

A flaw was found in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks whether the current number of connections crosses a certain threshold and if so, cleans up the previous connection. If the previous connection happens to be in the handshake phase and fails, QEMU cleans up the connection again, resulting in a NULL pointer dereference issue. This could allow a remote unauthenticated client to cause a denial of service.

NULL Pointer Dereference

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device

CVE-2023-1544 6.3 - Medium - March 23, 2023

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device. This flaw allows a crafted guest driver to allocate and initialize a huge number of page tables to be used as a ring of descriptors for CQ and async events, potentially leading to an out-of-bounds read and crash of QEMU.

Allocation of Resources Without Limits or Throttling

A vulnerability in the lsi53c895a device affects the latest version of qemu

CVE-2023-0330 6 - Medium - March 06, 2023

A vulnerability in the lsi53c895a device affects the latest version of qemu. A DMA-MMIO reentrancy problem may lead to memory corruption bugs like stack overflow or use-after-free.

Memory Corruption

An out-of-bounds read flaw was found in the QXL display device emulation in QEMU

CVE-2022-4144 6.5 - Medium - November 29, 2022

An out-of-bounds read flaw was found in the QXL display device emulation in QEMU. The qxl_phys2virt() function does not check the size of the structure pointed to by the guest physical address, potentially reading past the end of the bar space into adjacent pages. A malicious guest user could use this flaw to crash the QEMU process on the host causing a denial of service condition.

Out-of-bounds Read

An integer overflow and buffer overflow issues were found in the ACPI Error Record Serialization Table (ERST) device of QEMU in the read_erst_record() and write_erst_record() functions

CVE-2022-4172 6.5 - Medium - November 29, 2022

An integer overflow and buffer overflow issues were found in the ACPI Error Record Serialization Table (ERST) device of QEMU in the read_erst_record() and write_erst_record() functions. Both issues may allow the guest to overrun the host buffer allocated for the ERST memory device. A malicious guest could use these flaws to crash the QEMU process on the host.

Integer Overflow or Wraparound

An off-by-one read/write issue was found in the SDHCI device of QEMU

CVE-2022-3872 8.6 - High - November 07, 2022

An off-by-one read/write issue was found in the SDHCI device of QEMU. It occurs when reading/writing the Buffer Data Port Register in sdhci_read_dataport and sdhci_write_dataport, respectively, if data_count == block_size. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.

off-by-five

An integer underflow issue was found in the QEMU VNC server while processing ClientCutText messages in the extended format

CVE-2022-3165 6.5 - Medium - October 17, 2022

An integer underflow issue was found in the QEMU VNC server while processing ClientCutText messages in the extended format. A malicious client could use this flaw to make QEMU unresponsive by sending a specially crafted payload message, resulting in a denial of service.

Integer underflow

Qemu before 1.6.2 block diver for the various disk image formats used by Bochs and for the QCOW version 2 format, are vulnerable to a possible crash caused by signed data types or a logic error while creating QCOW2 snapshots

CVE-2014-0147 6.2 - Medium - September 29, 2022

Qemu before 1.6.2 block diver for the various disk image formats used by Bochs and for the QCOW version 2 format, are vulnerable to a possible crash caused by signed data types or a logic error while creating QCOW2 snapshots, which leads to incorrectly calling update_refcount() routine.

Integer Overflow or Wraparound

QEMU before 2.0.0 block drivers for CLOOP, QCOW2 version 2 and various other image formats are vulnerable to potential memory corruptions, integer/buffer overflows or crash caused by missing input validations which could

CVE-2014-0144 8.6 - High - September 29, 2022

QEMU before 2.0.0 block drivers for CLOOP, QCOW2 version 2 and various other image formats are vulnerable to potential memory corruptions, integer/buffer overflows or crash caused by missing input validations which could allow a remote user to execute arbitrary code on the host with the privileges of the QEMU process.

Improper Input Validation

Qemu before 2.0 block driver for Hyper-V VHDX Images is vulnerable to infinite loops and other potential issues when calculating BAT entries

CVE-2014-0148 5.5 - Medium - September 29, 2022

Qemu before 2.0 block driver for Hyper-V VHDX Images is vulnerable to infinite loops and other potential issues when calculating BAT entries, due to missing bounds checks for block_size and logical_sector_size variables. These are used to derive other fields like 'sectors_per_block' etc. A user able to alter the Qemu disk image could ise this flaw to crash the Qemu instance resulting in DoS.

Infinite Loop

A DMA reentrancy issue was found in the Tulip device emulation in QEMU

CVE-2022-2962 7.8 - High - September 13, 2022

A DMA reentrancy issue was found in the Tulip device emulation in QEMU. When Tulip reads or writes to the rx/tx descriptor or copies the rx/tx frame, it doesn't check whether the destination address is its own MMIO address. This can cause the device to trigger MMIO handlers multiple times, possibly leading to a stack or heap overflow. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.

Improper Synchronization

A flaw was found in the QEMU virtio-fs shared file system daemon (virtiofsd) implementation

CVE-2022-0358 7.8 - High - August 29, 2022

A flaw was found in the QEMU virtio-fs shared file system daemon (virtiofsd) implementation. This flaw is strictly related to CVE-2018-13405. A local guest user can create files in the directories shared by virtio-fs with unintended group ownership in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of the group. This could allow a malicious unprivileged user inside the guest to gain access to resources accessible to the root group, potentially escalating their privileges within the guest. A malicious local user in the host might also leverage this unexpected executable file created by the guest to escalate their privileges on the host system.

Improper Check for Dropped Privileges

A use-after-free vulnerability was found in the LSI53C895A SCSI Host Bus Adapter emulation of QEMU

CVE-2022-0216 4.4 - Medium - August 26, 2022

A use-after-free vulnerability was found in the LSI53C895A SCSI Host Bus Adapter emulation of QEMU. The flaw occurs while processing repeated messages to cancel the current SCSI request via the lsi_do_msgout function. This flaw allows a malicious privileged user within the guest to crash the QEMU process on the host, resulting in a denial of service.

Dangling pointer

A deadlock issue was found in the AHCI controller device of QEMU

CVE-2021-3735 4.4 - Medium - August 26, 2022

A deadlock issue was found in the AHCI controller device of QEMU. It occurs on a software reset (ahci_reset_port) while handling a host-to-device Register FIS (Frame Information Structure) packet from the guest. A privileged user inside the guest could use this flaw to hang the QEMU process on the host, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability.

Resource Exhaustion

A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU

CVE-2021-3929 8.2 - High - August 25, 2022

A DMA reentrancy issue was found in the NVM Express Controller (NVME) emulation in QEMU. This CVE is similar to CVE-2021-3750 and, just like it, when the reentrancy write triggers the reset function nvme_ctrl_reset(), data structs will be freed leading to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition or, potentially, executing arbitrary code within the context of the QEMU process on the host.

Dangling pointer

A NULL pointer dereference issue was found in the ACPI code of QEMU

CVE-2021-4158 6 - Medium - August 24, 2022

A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.

NULL Pointer Dereference

An infinite loop flaw was found in the USB xHCI controller emulation of QEMU while computing the length of the Transfer Request Block (TRB) Ring

CVE-2020-14394 3.2 - Low - August 17, 2022

An infinite loop flaw was found in the USB xHCI controller emulation of QEMU while computing the length of the Transfer Request Block (TRB) Ring. This flaw allows a privileged guest user to hang the QEMU process on the host, resulting in a denial of service.

Infinite Loop

softmmu/physmem.c in QEMU through 7.0.0

CVE-2022-35414 8.8 - High - July 11, 2022

softmmu/physmem.c in QEMU through 7.0.0 can perform an uninitialized read on the translate_fail path, leading to an io_readx or io_writex crash. NOTE: a third party states that the Non-virtualization Use Case in the qemu.org reference applies here, i.e., "Bugs affecting the non-virtualization use case are not considered security bugs at this time.

Use of Uninitialized Resource

A stack overflow vulnerability was found in the Intel HD Audio device (intel-hda) of QEMU

CVE-2021-3611 6.5 - Medium - May 11, 2022

A stack overflow vulnerability was found in the Intel HD Audio device (intel-hda) of QEMU. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition. The highest threat from this vulnerability is to system availability. This flaw affects QEMU versions prior to 7.0.0.

Buffer Overflow

A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU

CVE-2021-3750 8.2 - High - May 02, 2022

A DMA reentrancy issue was found in the USB EHCI controller emulation of QEMU. EHCI does not verify if the Buffer Pointer overlaps with its MMIO region when it transfers the USB packets. Crafted content may be written to the controller's registers and trigger undesirable actions (such as reset) while the device is still transferring packets. This can ultimately lead to a use-after-free issue. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition, or potentially execute arbitrary code within the context of the QEMU process on the host. This flaw affects QEMU versions before 7.0.0.

Dangling pointer

A flaw was found in the QXL display device emulation in QEMU

CVE-2021-4206 8.2 - High - April 29, 2022

A flaw was found in the QXL display device emulation in QEMU. An integer overflow in the cursor_alloc() function can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. This flaw allows a malicious privileged guest user to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.

Integer Overflow or Wraparound

A flaw was found in the QXL display device emulation in QEMU

CVE-2021-4207 8.2 - High - April 29, 2022

A flaw was found in the QXL display device emulation in QEMU. A double fetch of guest controlled values `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.

Race Condition

It was discovered that the update for the virt:rhel module in the RHSA-2020:4676 (https://access.redhat.com/errata/RHSA-2020:4676) erratum released as part of Red Hat Enterprise Linux 8.3 failed to include the fix for the qemu-kvm component issue CVE-2020-10756, which was previously corrected in virt:rhel/qemu-kvm

CVE-2021-20295 6.5 - Medium - April 01, 2022

It was discovered that the update for the virt:rhel module in the RHSA-2020:4676 (https://access.redhat.com/errata/RHSA-2020:4676) erratum released as part of Red Hat Enterprise Linux 8.3 failed to include the fix for the qemu-kvm component issue CVE-2020-10756, which was previously corrected in virt:rhel/qemu-kvm via erratum RHSA-2020:4059 (https://access.redhat.com/errata/RHSA-2020:4059). CVE-2021-20295 was assigned to that Red Hat specific security regression. For more details about the original security issue CVE-2020-10756, refer to bug 1835986 or the CVE page: https://access.redhat.com/security/cve/CVE-2020-10756.

Out-of-bounds Read

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device

CVE-2022-1050 8.8 - High - March 29, 2022

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device. This flaw allows a crafted guest driver to execute HW commands when shared buffers are not yet allocated, potentially leading to a use-after-free condition.

Dangling pointer

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device

CVE-2021-3582 6.5 - Medium - March 25, 2022

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device. The issue occurs while handling a "PVRDMA_CMD_CREATE_MR" command due to improper memory remapping (mremap). This flaw allows a malicious guest to crash the QEMU process on the host. The highest threat from this vulnerability is to system availability.

Buffer Overflow

A use-after-free vulnerability was found in the virtio-net device of QEMU

CVE-2021-3748 7.5 - High - March 23, 2022

A use-after-free vulnerability was found in the virtio-net device of QEMU. It could occur when the descriptor's address belongs to the non direct access region, due to num_buffers being set after the virtqueue elem has been unmapped. A malicious guest could use this flaw to crash QEMU, resulting in a denial of service condition, or potentially execute code on the host with the privileges of the QEMU process.

Dangling pointer

A flaw was found in the virtio-net device of QEMU

CVE-2022-26353 7.5 - High - March 16, 2022

A flaw was found in the virtio-net device of QEMU. This flaw was inadvertently introduced with the fix for CVE-2021-3748, which forgot to unmap the cached virtqueue elements on error, leading to memory leakage and other unexpected results. Affected QEMU version: 6.2.0.

Missing Release of Resource after Effective Lifetime

A flaw was found in the vhost-vsock device of QEMU

CVE-2022-26354 3.2 - Low - March 16, 2022

A flaw was found in the vhost-vsock device of QEMU. In case of error, an invalid element was not detached from the virtqueue before freeing its memory, leading to memory leakage and other unexpected results. Affected QEMU versions <= 6.2.0.

Missing Release of Resource after Effective Lifetime

An infinite loop flaw was found in the e1000 NIC emulator of the QEMU

CVE-2021-20257 6.5 - Medium - March 16, 2022

An infinite loop flaw was found in the e1000 NIC emulator of the QEMU. This issue occurs while processing transmits (tx) descriptors in process_tx_desc if various descriptor fields are initialized with invalid values. This flaw allows a guest to consume CPU cycles on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Infinite Loop

An out-of-bounds memory access flaw was found in the ATI VGA device emulation of QEMU

CVE-2021-3638 6.5 - Medium - March 03, 2022

An out-of-bounds memory access flaw was found in the ATI VGA device emulation of QEMU. This flaw occurs in the ati_2d_blt() routine while handling MMIO write operations when the guest provides invalid values for the destination display parameters. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service.

Memory Corruption

An integer overflow was found in the QEMU implementation of VMWare's paravirtual RDMA device in versions prior to 6.1.0

CVE-2021-3607 6 - Medium - February 24, 2022

An integer overflow was found in the QEMU implementation of VMWare's paravirtual RDMA device in versions prior to 6.1.0. The issue occurs while handling a "PVRDMA_REG_DSRHIGH" write from the guest due to improper input validation. This flaw allows a privileged guest user to make QEMU allocate a large amount of memory, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Integer Overflow or Wraparound

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device in versions prior to 6.1.0

CVE-2021-3608 6 - Medium - February 24, 2022

A flaw was found in the QEMU implementation of VMWare's paravirtual RDMA device in versions prior to 6.1.0. The issue occurs while handling a "PVRDMA_REG_DSRHIGH" write from the guest and may result in a crash of QEMU or cause undefined behavior due to the access of an uninitialized pointer. The highest threat from this vulnerability is to system availability.

Access of Uninitialized Pointer

An off-by-one error was found in the SCSI device emulation in QEMU

CVE-2021-3930 6.5 - Medium - February 18, 2022

An off-by-one error was found in the SCSI device emulation in QEMU. It could occur while processing MODE SELECT commands in mode_sense_page() if the 'page' argument was set to MODE_PAGE_ALLS (0x3f). A malicious guest could use this flaw to potentially crash QEMU, resulting in a denial of service condition.

off-by-five

A stack-buffer-overflow was found in QEMU in the NVME component

CVE-2021-3947 5.5 - Medium - February 18, 2022

A stack-buffer-overflow was found in QEMU in the NVME component. The flaw lies in nvme_changed_nslist() where a malicious guest controlling certain input can read out of bounds memory. A malicious user could use this flaw leading to disclosure of sensitive information.

Out-of-bounds Read

A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0

CVE-2021-4145 6.5 - Medium - January 25, 2022

A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0. The `self` pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host when writing data reaches the threshold of mirroring node.

NULL Pointer Dereference

An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions prior to 6.2.0-rc0

CVE-2021-3713 7.4 - High - August 25, 2021

An out-of-bounds write flaw was found in the UAS (USB Attached SCSI) device emulation of QEMU in versions prior to 6.2.0-rc0. The device uses the guest supplied stream number unchecked, which can lead to out-of-bounds access to the UASDevice->data3 and UASDevice->status3 fields. A malicious guest user could use this flaw to crash QEMU or potentially achieve code execution with the privileges of the QEMU process on the host.

Memory Corruption

A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2

CVE-2021-3682 8.5 - High - August 05, 2021

A flaw was found in the USB redirector device emulation of QEMU in versions prior to 6.1.0-rc2. It occurs when dropping packets during a bulk transfer from a SPICE client due to the packet queue being full. A malicious SPICE client could use this flaw to make QEMU call free() with faked heap chunk metadata, resulting in a crash of QEMU or potential code execution with the privileges of the QEMU process on the host.

Release of Invalid Pointer or Reference

A divide-by-zero issue was found in dwc2_handle_packet in hw/usb/hcd-dwc2.c in the hcd-dwc2 USB host controller emulation of QEMU

CVE-2020-27661 6.5 - Medium - June 02, 2021

A divide-by-zero issue was found in dwc2_handle_packet in hw/usb/hcd-dwc2.c in the hcd-dwc2 USB host controller emulation of QEMU. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service.

Divide By Zero

The ahci_commit_buf function in ide/ahci.c in QEMU

CVE-2019-12067 6.5 - Medium - June 02, 2021

The ahci_commit_buf function in ide/ahci.c in QEMU allows attackers to cause a denial of service (NULL dereference) when the command header 'ad->cur_cmd' is null.

NULL Pointer Dereference

A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0

CVE-2020-35503 6 - Medium - June 02, 2021

A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

NULL Pointer Dereference

Several memory leaks were found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0

CVE-2021-3544 6.5 - Medium - June 02, 2021

Several memory leaks were found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0. They exist in contrib/vhost-user-gpu/vhost-user-gpu.c and contrib/vhost-user-gpu/virgl.c due to improper release of memory (i.e., free) after effective lifetime.

Memory Leak

An information disclosure vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0

CVE-2021-3545 6.5 - Medium - June 02, 2021

An information disclosure vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0. The flaw exists in virgl_cmd_get_capset_info() in contrib/vhost-user-gpu/virgl.c and could occur due to the read of uninitialized memory. A malicious guest could exploit this issue to leak memory from the host.

Use of Uninitialized Resource

An out-of-bounds write vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0

CVE-2021-3546 8.2 - High - June 02, 2021

An out-of-bounds write vulnerability was found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0. The flaw occurs while processing the 'VIRTIO_GPU_CMD_GET_CAPSET' command from the guest. It could allow a privileged guest user to crash the QEMU process on the host, resulting in a denial of service condition, or potential code execution with the privileges of the QEMU process.

Memory Corruption

An user able to alter the savevm data (either on the disk or over the wire during migration) could use this flaw to to corrupt QEMU process memory on the (destination) host

CVE-2013-4536 7.8 - High - May 28, 2021

An user able to alter the savevm data (either on the disk or over the wire during migration) could use this flaw to to corrupt QEMU process memory on the (destination) host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process.

Improper Privilege Management

A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0

CVE-2020-35505 4.4 - Medium - May 28, 2021

A NULL pointer dereference flaw was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0. This issue occurs while handling the 'Information Transfer' command. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

NULL Pointer Dereference

A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI)

CVE-2020-35506 6.7 - Medium - May 28, 2021

A use-after-free vulnerability was found in the am53c974 SCSI host bus adapter emulation of QEMU in versions before 6.0.0 during the handling of the 'Information Transfer' command (CMD_TI). This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service or potential code execution with the privileges of the QEMU process.

Dangling pointer

A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0

CVE-2020-35504 6 - Medium - May 28, 2021

A NULL pointer dereference flaw was found in the SCSI emulation support of QEMU in versions before 6.0.0. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

NULL Pointer Dereference

A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU

CVE-2021-20196 6.5 - Medium - May 26, 2021

A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

NULL Pointer Dereference

A flaw was found in the USB redirector device (usb-redir) of QEMU

CVE-2021-3527 5.5 - Medium - May 26, 2021

A flaw was found in the USB redirector device (usb-redir) of QEMU. Small USB packets are combined into a single, large transfer request, to reduce the overhead and improve performance. The combined size of the bulk transfer is used to dynamically allocate a variable length array (VLA) on the stack without proper validation. Since the total size is not bounded, a malicious guest could use this flaw to influence the array length and cause the QEMU process to perform an excessive allocation on the stack, resulting in a denial of service.

Allocation of Resources Without Limits or Throttling

A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0

CVE-2021-20181 7.5 - High - May 13, 2021

A race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.

Race Condition

An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of QEMU up to and including qemu 4.2.0on aarch64 platform

CVE-2021-20221 6 - Medium - May 13, 2021

An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of QEMU up to and including qemu 4.2.0on aarch64 platform. The issue occurs because while writing an interrupt ID to the controller memory area, it is not masked to be 4 bits wide. It may lead to the said issue while updating controller state fields and their subsequent processing. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Out-of-bounds Read

A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0 (including)

CVE-2021-3507 6.1 - Medium - May 06, 2021

A heap buffer overflow was found in the floppy disk emulator of QEMU up to 6.0.0 (including). It could occur in fdctrl_transfer_handler() in hw/block/fdc.c while processing DMA read data transfers from the floppy drive to the guest system. A privileged guest user could use this flaw to crash the QEMU process on the host resulting in DoS scenario, or potential information leakage from the host memory.

Buffer Overflow

The patch for CVE-2020-17380/CVE-2020-25085 was found to be ineffective

CVE-2021-3409 5.7 - Medium - March 23, 2021

The patch for CVE-2020-17380/CVE-2020-25085 was found to be ineffective, thus making QEMU vulnerable to the out-of-bounds read/write access issues previously found in the SDHCI controller emulation code. This flaw allows a malicious privileged guest to crash the QEMU process on the host, resulting in a denial of service or potential code execution. QEMU up to (including) 5.2.0 is affected by this.

Buffer Overflow

A use-after-free flaw was found in the MegaRAID emulator of QEMU

CVE-2021-3392 3.2 - Low - March 23, 2021

A use-after-free flaw was found in the MegaRAID emulator of QEMU. This issue occurs while processing SCSI I/O requests in the case of an error mptsas_free_request() that does not dequeue the request object 'req' from a pending requests queue. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. Versions between 2.10.0 and 5.2.0 are potentially affected.

Dangling pointer

A potential stack overflow via infinite loop issue was found in various NIC emulators of QEMU in versions up to and including 5.2.0

CVE-2021-3416 6 - Medium - March 18, 2021

A potential stack overflow via infinite loop issue was found in various NIC emulators of QEMU in versions up to and including 5.2.0. The issue occurs in loopback mode of a NIC wherein reentrant DMA checks get bypassed. A guest user/process may use this flaw to consume CPU cycles or crash the QEMU process on the host resulting in DoS scenario.

Infinite Loop

A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator of QEMU

CVE-2021-20255 5.5 - Medium - March 09, 2021

A stack overflow via an infinite recursion vulnerability was found in the eepro100 i8255x device emulator of QEMU. This issue occurs while processing controller commands due to a DMA reentry issue. This flaw allows a guest user or process to consume CPU cycles or crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Stack Exhaustion

A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU

CVE-2021-20263 3.3 - Low - March 09, 2021

A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest.

Improper Preservation of Permissions

An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0

CVE-2021-20203 3.2 - Low - February 25, 2021

An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Integer Overflow or Wraparound

A heap-based buffer overflow was found in QEMU through 5.0.0 in the SDHCI device emulation support

CVE-2020-17380 6.3 - Medium - January 30, 2021

A heap-based buffer overflow was found in QEMU through 5.0.0 in the SDHCI device emulation support. It could occur while doing a multi block SDMA transfer via the sdhci_sdma_transfer_multi_blocks() routine in hw/sd/sdhci.c. A guest user or process could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition, or potentially execute arbitrary code with privileges of the QEMU process on the host.

Memory Corruption

A flaw was found in qemu

CVE-2020-35517 8.2 - High - January 28, 2021

A flaw was found in qemu. A host privilege escalation issue was found in the virtio-fs shared file system daemon where a privileged guest user is able to create a device special file in the shared directory and use it to r/w access host devices.

Improper Privilege Management

ide_atapi_cmd_reply_end in hw/ide/atapi.c in QEMU 5.1.0

CVE-2020-29443 3.9 - Low - January 26, 2021

ide_atapi_cmd_reply_end in hw/ide/atapi.c in QEMU 5.1.0 allows out-of-bounds read access because a buffer index is not validated.

Out-of-bounds Read

In QEMU 4.1.0, an out-of-bounds read flaw was found in the ATI VGA implementation

CVE-2019-20808 6.5 - Medium - December 31, 2020

In QEMU 4.1.0, an out-of-bounds read flaw was found in the ATI VGA implementation. It occurs in the ati_cursor_define() routine while handling MMIO write operations through the ati_mm_write() callback. A malicious guest could abuse this flaw to crash the QEMU process, resulting in a denial of service.

Out-of-bounds Read

A flaw was found in the memory management API of QEMU during the initialization of a memory region cache

CVE-2020-27821 6 - Medium - December 08, 2020

A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.

Memory Corruption

hw/net/e1000e_core.c in QEMU 5.0.0 has an infinite loop

CVE-2020-28916 5.5 - Medium - December 04, 2020

hw/net/e1000e_core.c in QEMU 5.0.0 has an infinite loop via an RX descriptor with a NULL buffer address.

Infinite Loop

A reachable assertion issue was found in the USB EHCI emulation code of QEMU

CVE-2020-25723 3.2 - Low - December 02, 2020

A reachable assertion issue was found in the USB EHCI emulation code of QEMU. It could occur while processing USB requests due to missing handling of DMA memory map failure. A malicious privileged user within the guest may abuse this flaw to send bogus USB requests and crash the QEMU process on the host, resulting in a denial of service.

assertion failure

hw/usb/hcd-ohci.c in QEMU 5.0.0 has a stack-based buffer over-read

CVE-2020-25624 5 - Medium - November 30, 2020

hw/usb/hcd-ohci.c in QEMU 5.0.0 has a stack-based buffer over-read via values obtained from the host controller driver.

Out-of-bounds Read

eth_get_gso_type in net/eth.c in QEMU 4.2.1 allows guest OS users to trigger an assertion failure

CVE-2020-27617 6.5 - Medium - November 06, 2020

eth_get_gso_type in net/eth.c in QEMU 4.2.1 allows guest OS users to trigger an assertion failure. A guest can crash the QEMU process via packet data that lacks a valid Layer 3 protocol.

assertion failure

ati_2d_blt in hw/display/ati_2d.c in QEMU 4.2.1 can encounter an outside-limits situation in a calculation

CVE-2020-27616 6.5 - Medium - November 06, 2020

ati_2d_blt in hw/display/ati_2d.c in QEMU 4.2.1 can encounter an outside-limits situation in a calculation. A guest can crash the QEMU process.

Incorrect Calculation

An issue was discovered in QEMU through 5.1.0

CVE-2020-24352 5.5 - Medium - October 16, 2020

An issue was discovered in QEMU through 5.1.0. An out-of-bounds memory access was found in the ATI VGA device implementation. This flaw occurs in the ati_2d_blt() routine in hw/display/ati_2d.c while handling MMIO write operations through the ati_mm_write() callback. A malicious guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service.

Buffer Overflow

hw/ide/pci.c in QEMU before 5.1.1 can trigger a NULL pointer dereference

CVE-2020-25743 3.2 - Low - October 06, 2020

hw/ide/pci.c in QEMU before 5.1.1 can trigger a NULL pointer dereference because it lacks a pointer check before an ide_cancel_dma_sync call.

NULL Pointer Dereference

pci_change_irq_level in hw/pci/pci.c in QEMU before 5.1.1 has a NULL pointer dereference

CVE-2020-25742 3.2 - Low - October 06, 2020

pci_change_irq_level in hw/pci/pci.c in QEMU before 5.1.1 has a NULL pointer dereference because pci_get_bus() might not return a valid pointer.

NULL Pointer Dereference

fdctrl_write_data in hw/block/fdc.c in QEMU 5.0.0 has a NULL pointer dereference

CVE-2020-25741 3.2 - Low - October 02, 2020

fdctrl_write_data in hw/block/fdc.c in QEMU 5.0.0 has a NULL pointer dereference via a NULL block pointer for the current drive.

NULL Pointer Dereference

hw/usb/hcd-ohci.c in QEMU 5.0.0 has an infinite loop when a TD list has a loop.

CVE-2020-25625 5.3 - Medium - September 25, 2020

hw/usb/hcd-ohci.c in QEMU 5.0.0 has an infinite loop when a TD list has a loop.

Infinite Loop

QEMU 5.0.0 has a use-after-free in hw/usb/hcd-xhci.c

CVE-2020-25084 3.2 - Low - September 25, 2020

QEMU 5.0.0 has a use-after-free in hw/usb/hcd-xhci.c because the usb_packet_map return value is not checked.

Dangling pointer

QEMU 5.0.0 has a heap-based Buffer Overflow in flatview_read_continue in exec.c

CVE-2020-25085 5 - Medium - September 25, 2020

QEMU 5.0.0 has a heap-based Buffer Overflow in flatview_read_continue in exec.c because hw/sd/sdhci.c mishandles a write operation in the SDHC_BLKSIZE case.

Memory Corruption

An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU in versions before 5.2.0

CVE-2020-14364 5 - Medium - August 31, 2020

An out-of-bounds read/write access flaw was found in the USB emulator of the QEMU in versions before 5.2.0. This issue occurs while processing USB packets from a guest when USBDevice 'setup_len' exceeds its 'data_buf[4096]' in the do_token_in, do_token_out routines. This flaw allows a guest user to crash the QEMU process, resulting in a denial of service, or the potential execution of arbitrary code with the privileges of the QEMU process on the host.

Out-of-bounds Read

In QEMU through 5.0.0, an integer overflow was found in the SM501 display driver implementation

CVE-2020-12829 3.8 - Low - August 31, 2020

In QEMU through 5.0.0, an integer overflow was found in the SM501 display driver implementation. This flaw occurs in the COPY_AREA macro while handling MMIO write operations through the sm501_2d_engine_write() callback. A local attacker could abuse this flaw to crash the QEMU process in sm501_2d_operation() in hw/display/sm501.c on the host, resulting in a denial of service.

Integer Overflow or Wraparound

oss_write in audio/ossaudio.c in QEMU before 5.0.0 mishandles a buffer position.

CVE-2020-14415 3.3 - Low - August 27, 2020

oss_write in audio/ossaudio.c in QEMU before 5.0.0 mishandles a buffer position.

Divide By Zero

In QEMU through 5.0.0, an assertion failure can occur in the network packet processing

CVE-2020-16092 3.8 - Low - August 11, 2020

In QEMU through 5.0.0, an assertion failure can occur in the network packet processing. This issue affects the e1000e and vmxnet3 network devices. A malicious guest user/process could use this flaw to abort the QEMU process on the host, resulting in a denial of service condition in net_tx_pkt_add_raw_fragment in hw/net/net_tx_pkt.c.

assertion failure

hw/net/xgmac.c in the XGMAC Ethernet controller in QEMU before 07-20-2020 has a buffer overflow

CVE-2020-15863 5.3 - Medium - July 28, 2020

hw/net/xgmac.c in the XGMAC Ethernet controller in QEMU before 07-20-2020 has a buffer overflow. This occurs during packet transmission and affects the highbank and midway emulated machines. A guest user or process could use this flaw to crash the QEMU process on the host, resulting in a denial of service or potential privileged code execution. This was fixed in commit 5519724a13664b43e225ca05351c60b4468e4555.

Memory Corruption

QEMU 4.2.0 has a use-after-free in hw/net/e1000e_core.c

CVE-2020-15859 3.3 - Low - July 21, 2020

QEMU 4.2.0 has a use-after-free in hw/net/e1000e_core.c because a guest OS user can trigger an e1000e packet with the data's address set to the e1000e's MMIO address.

Dangling pointer

In QEMU 4.2.0

CVE-2020-15469 2.3 - Low - July 02, 2020

In QEMU 4.2.0, a MemoryRegionOps object may lack read/write callback methods, leading to a NULL pointer dereference.

NULL Pointer Dereference

An assertion failure issue was found in the Network Block Device(NBD) Server in all QEMU versions before QEMU 5.0.1

CVE-2020-10761 5 - Medium - June 09, 2020

An assertion failure issue was found in the Network Block Device(NBD) Server in all QEMU versions before QEMU 5.0.1. This flaw occurs when an nbd-client sends a spec-compliant request that is near the boundary of maximum permitted request length. A remote nbd-client could use this flaw to crash the qemu-nbd server resulting in a denial of service.

assertion failure

A flaw was found in QEMU in the implementation of the Pointer Authentication (PAuth) support for ARM introduced in version 4.0 and fixed in version 5.0.0

CVE-2020-10702 5.5 - Medium - June 04, 2020

A flaw was found in QEMU in the implementation of the Pointer Authentication (PAuth) support for ARM introduced in version 4.0 and fixed in version 5.0.0. A general failure of the signature generation process caused every PAuth-enforced pointer to be signed with the same signature. A local attacker could obtain the signature of a protected pointer and abuse this flaw to bypass PAuth protection for all programs running on QEMU.

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QEMU is a generic and open source machine emulator and virtualizer.

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