Denx U Boot

U-Boot <2026.10-rc5 OOB read in dhcp6_parse_options via DHCPv6
CVE-2026-74225 7.1 - High - September 29, 2026

U-Boot before 2026.10-rc5 contains out-of-bounds memory access in dhcp6_parse_options() that fails to validate SERVERID and CLIENTID option lengths from DHCPv6 packets. Attackers on the local network can send crafted DHCPv6 ADVERTISE or REPLY packets during netboot to corrupt memory and crash the bootloader.

Memory Corruption

U-Boot <2026.10-rc5 Use-After-Free in httpc_recv_cb() lwIP wget
CVE-2026-74222 8.8 - High - September 29, 2026

U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the httpc_recv_cb() function within the lwIP wget implementation. When HTTP data storage fails, the callback frees the connection PCB but returns ERR_BUF instead of ERR_ABRT, causing the TCP input path to access released memory and crash the bootloader.

Dangling pointer

U-Boot <=2026.10-rc5 NFS Readlink Buffer Overflow
CVE-2026-74221 8.8 - High - September 29, 2026

U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.

Signed to Unsigned Conversion Error

U-Boot <2026.10-rc5 Buffer Overflow in nfs_read_reply()
CVE-2026-74220 8.8 - High - September 29, 2026

U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_read_reply() function in net/nfs-common.c that allows attackers to corrupt memory by supplying crafted NFS READ reply lengths. A malicious NFS server can exploit signed integer handling to bypass length validation and write far past the destination buffer, crashing the bootloader or corrupting memory.

Signed to Unsigned Conversion Error

U-Boot OOB Write in read_slotted_partition() (pre2026.10rc3)
CVE-2026-71974 4.3 - Medium - September 29, 2026

U-Boot before 2026.10-rc3 contains an out-of-bounds write vulnerability in read_slotted_partition() that fails to validate image size against partition bounds. Attackers with physical access can supply crafted boot media with oversized headers to write past the load buffer into bootloader memory on devices without Android Verified Boot protection.

Memory Corruption

U-Boot <2026.10-rc4 Integer Overflow in sqfs_read_directory_table()
CVE-2026-71973 5.2 - Medium - September 29, 2026

U-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer. Attackers can supply a crafted SquashFS image with an attacker-controlled superblock metablks_count value that causes heap buffer under-allocation and out-of-bounds writes, corrupting heap memory and crashing the bootloader.

Integer Overflow or Wraparound

U-Boot <2026.10-rc5 OOB Write in video_display_rle8_bitmap via RLE8 BMP
CVE-2026-71972 6 - Medium - September 29, 2026

U-Boot through 2026.10-rc5 contains an out-of-bounds write vulnerability in the video_display_rle8_bitmap function in drivers/video/video_bmp.c. Attackers can supply a crafted RLE8-compressed BMP image to corrupt memory adjacent to the framebuffer and crash the bootloader.

Memory Corruption

U-Boot <2026.10-rc3 IP_DEFRAG OOBW in __net_defragment()
CVE-2026-71971 8.8 - High - September 29, 2026

U-Boot before 2026.10-rc3 with CONFIG_IP_DEFRAG enabled contains an out-of-bounds write vulnerability in the __net_defragment() function in net/net.c. Remote attackers can send a crafted IP fragment with non-zero offset and More-Fragments flag set during netboot to corrupt adjacent memory and crash the bootloader.

Memory Corruption

Das U-Boot IP Reassembly State Leak Arbitrary Code via IP Fragments
CVE-2026-15390 9 - Critical - September 29, 2026

Das U-Boot with CONFIG_IP_DEFRAG=y parameter fails to clear IP reassembly state after delivering a complete datagram. An attacker who can deliver fragmented IP traffic can execute arbitrary code by sending duplicated last-fragment IP packets. This issue was fixed in commit b1aec609bb5e0d08c25c888c91935287ab4ee5fa in version 2026.07.

Memory Corruption

Denx U-Boot before 2026.04: ZFS int overflow OOB
CVE-2025-70290 9.8 - Critical - August 26, 2026

An issue was discovered in Denx U-Boot before 2026.04. An integer overflow vulnerability in the ZFS filesystem support can be triggered by malformed on-disk metadata. The issue may result in incorrect memory allocation followed by out-of-bounds memory access, potentially leading to a crash or arbitrary code execution during the boot process.

Memory Corruption

Denx U-Boot <2026.04 Integer Overflow in ext4fs_get_bgdtable
CVE-2025-70293 9.8 - Critical - August 26, 2026

An issue was discovered in Denx U-Boot before 2026.04. An integer overflow vulnerability exists in function ext4fs_get_bgdtable, the size calculation can lead to under allocation and this underallocated buffer will be used in memcpy() which could lead to arbitrary code execution, a denial of service, or other unspecified impacts.

Integer Overflow or Wraparound

U-Boot <2026.04-rc3 buffer overflow in nfs_readlink_reply()
CVE-2026-29009 8.2 - High - July 08, 2026

U-Boot before 2026.07-rc2 contains a buffer overflow vulnerability in nfs_readlink_reply() (net/nfs-common.c) when CONFIG_CMD_NFS is enabled, allowing a malicious or compromised NFS server to overflow the 2048-byte nfs_path_buff buffer by returning multiple relative symlink targets that are appended without cumulative length validation. Attackers can send two or more READLINK responses containing relative symlink targets of approximately 1100 bytes each to corrupt adjacent BSS variables including nfs_server_ip, nfs_server_mount_port, nfs_server_port, nfs_our_port, nfs_state, and rpc_id, potentially achieving memory corruption and control over the NFS client state machine.

Classic Buffer Overflow

U-Boot <=2026.04-rc3 Integer Underflow in tcp_rx_state_machine Crash
CVE-2026-29008 7.5 - High - July 08, 2026

U-Boot through 2026.04-rc3 contains an integer underflow vulnerability in the tcp_rx_state_machine() function (net/tcp.c) that allows a network-adjacent attacker to crash the bootloader by sending a malformed TCP SYN+ACK packet with a manipulated data offset field causing payload_len to become negative. When the TCP_SYN_SENT handler calls tcp_rx_user_data() without invoking tcp_seg_in_wnd() validation, the negative payload_len is implicitly converted to a large unsigned integer (e.g., 0xFFFFFFD8) and passed to memcpy() in store_block(), causing an immediate crash that prevents device boot and may enable memory corruption when CONFIG_LMB is disabled.

Integer underflow

U-Boot 2026.04-rc3: OOB Read via tcp_rx_state_machine() with CONFIG_PROT_TCP
CVE-2026-29007 5.3 - Medium - July 08, 2026

U-Boot through 2026.04-rc3 contains an out-of-bounds read vulnerability in tcp_rx_state_machine() (net/tcp.c) when CONFIG_PROT_TCP is enabled, allowing remote attackers to read beyond TCP segment boundaries by crafting a malicious packet with a mismatched IP total length and TCP data offset field. Attackers can send a packet with an IP total length of 40 bytes and a TCP data offset claiming 60 bytes of header to cause tcp_parse_options() to read 40 bytes past the end of the TCP segment, potentially corrupting connection state variables such as rmt_win_scale and rmt_timestamp to disrupt TCP window calculations.

Out-of-bounds Read

U-Boot FIT Signature Verification Bypass before 2026.04
CVE-2026-46728 8.2 - High - May 16, 2026

Das U-Boot before 2026.04 allows FIT (Flat Image Tree) signature verification bypass because hashed-nodes is omitted from a hash.

Origin Validation Error

U-Boot append_uint32_le Fault Injection Physical PrivEsc without Interaction
CVE-2025-36938 6.8 - Medium - December 11, 2025

In U-Boot of append_uint32_le(), there is a possible fault injection due to a logic error in the code. This could lead to physical escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

Protection Mechanism Failure

U-Boot heap CVE-2024-57259: off-by-1 in sqfs_search_dir ( 2025.01-rc1)
CVE-2024-57259 7.1 - High - February 18, 2025

sqfs_search_dir in Das U-Boot before 2025.01-rc1 exhibits an off-by-one error and resultant heap memory corruption for squashfs directory listing because the path separator is not considered in a size calculation.

off-by-five

Das U-boot <=2025.01-rc1 Mem Alloc Int Overflow via Squashfs
CVE-2024-57258 7.1 - High - February 18, 2025

Integer overflows in memory allocation in Das U-Boot before 2025.01-rc1 occur for a crafted squashfs filesystem via sbrk, via request2size, or because ptrdiff_t is mishandled on x86_64.

Integer Overflow or Wraparound

Stack Consumption in Das U-Boot <2025.01-rc1 via Symlink nesting in squashfs
CVE-2024-57257 2 - Low - February 18, 2025

A stack consumption issue in sqfs_size in Das U-Boot before 2025.01-rc1 occurs via a crafted squashfs filesystem with deep symlink nesting.

Stack Exhaustion

Integer Overflow in Das U-Boot ext4fs_read_symlink (2025.01-rc1)
CVE-2024-57256 7.1 - High - February 18, 2025

An integer overflow in ext4fs_read_symlink in Das U-Boot before 2025.01-rc1 occurs for zalloc (adding one to an le32 variable) via a crafted ext4 filesystem with an inode size of 0xffffffff, resulting in a malloc of zero and resultant memory overwrite.

Integer Overflow or Wraparound

Integer Overflow in sqfs_resolve_symlink (Das U-Boot <2025.01-rc1)
CVE-2024-57255 7.1 - High - February 18, 2025

An integer overflow in sqfs_resolve_symlink in Das U-Boot before 2025.01-rc1 occurs via a crafted squashfs filesystem with an inode size of 0xffffffff, resulting in a malloc of zero and resultant memory overwrite.

Integer Overflow or Wraparound

Integer Overflow in U-Boot sqfs_inode_size before 2025.01-rc1
CVE-2024-57254 7.1 - High - February 18, 2025

An integer overflow in sqfs_inode_size in Das U-Boot before 2025.01-rc1 occurs in the symlink size calculation via a crafted squashfs filesystem.

Integer Overflow or Wraparound

Secure Boot Bypass Vulnerability in U-Boot Firmware
CVE-2024-28922 4.1 - Medium - April 09, 2024

Secure Boot Security Feature Bypass Vulnerability

U-Boot DFU Length Overflow Vulnerability
CVE-2022-2347 7.7 - High - September 23, 2022

There exists an unchecked length field in UBoot. The U-Boot DFU implementation does not bound the length field in USB DFU download setup packets, and it does not verify that the transfer direction corresponds to the specified command. Consequently, if a physical attacker crafts a USB DFU download setup packet with a `wLength` greater than 4096 bytes, they can write beyond the heap-allocated request buffer.

Heap-based Buffer Overflow

squashfs filesystem implementation of U-Boot versions
CVE-2022-33967 7.8 - High - July 20, 2022

squashfs filesystem implementation of U-Boot versions from v2020.10-rc2 to v2022.07-rc5 contains a heap-based buffer overflow vulnerability due to a defect in the metadata reading process. Loading a specially crafted squashfs image may lead to a denial-of-service (DoS) condition or arbitrary code execution.

Memory Corruption

Das U-Boot from v2020.10 to v2022.07-rc3 was discovered to contain an out-of-bounds write
CVE-2022-33103 7.8 - High - July 01, 2022

Das U-Boot from v2020.10 to v2022.07-rc3 was discovered to contain an out-of-bounds write via the function sqfs_readdir().

Memory Corruption

In Das U-Boot through 2022.07-rc5
CVE-2022-34835 - June 30, 2022

In Das U-Boot through 2022.07-rc5, an integer signedness error and resultant stack-based buffer overflow in the "i2c md" command enables the corruption of the return address pointer of the do_i2c_md function.

Das U-Boot 2022.01 has a Buffer Overflow.
CVE-2022-30552 - June 08, 2022

Das U-Boot 2022.01 has a Buffer Overflow.

Das U-Boot 2022.01 has a Buffer Overflow
CVE-2022-30790 - June 08, 2022

Das U-Boot 2022.01 has a Buffer Overflow, a different issue than CVE-2022-30552.

nfs_lookup_reply in net/nfs.c in Das U-Boot through 2022.04 (and through 2022.07-rc2) has an unbounded memcpy with a failed length check
CVE-2022-30767 9.8 - Critical - May 16, 2022

nfs_lookup_reply in net/nfs.c in Das U-Boot through 2022.04 (and through 2022.07-rc2) has an unbounded memcpy with a failed length check, leading to a buffer overflow. NOTE: this issue exists because of an incorrect fix for CVE-2019-14196.

Classic Buffer Overflow

The boot loader in Das U-Boot before 2021.04-rc2 mishandles use of unit addresses in a FIT.
CVE-2021-27138 7.8 - High - February 17, 2021

The boot loader in Das U-Boot before 2021.04-rc2 mishandles use of unit addresses in a FIT.

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.
CVE-2021-27097 7.8 - High - February 17, 2021

The boot loader in Das U-Boot before 2021.04-rc2 mishandles a modified FIT.

Das U-Boot through 2020.01
CVE-2020-10648 - March 19, 2020

Das U-Boot through 2020.01 allows attackers to bypass verified boot restrictions and subsequently boot arbitrary images by providing a crafted FIT image to a system configured to boot the default configuration.

In Das U-Boot through 2020.01, a double free has been found in the cmd/gpt.c do_rename_gpt_parts() function
CVE-2020-8432 - January 29, 2020

In Das U-Boot through 2020.01, a double free has been found in the cmd/gpt.c do_rename_gpt_parts() function. Double freeing may result in a write-what-where condition, allowing an attacker to execute arbitrary code. NOTE: this vulnerablity was introduced when attempting to fix a memory leak identified by static analysis.

Das U-Boot versions 2019.07-rc1 through 2019.07-rc4
CVE-2019-13105 - August 06, 2019

Das U-Boot versions 2019.07-rc1 through 2019.07-rc4 can double-free a cached block of data when listing files in a crafted ext4 filesystem.

Das U-Boot versions 2016.09 through 2019.07-rc4 can memset() too much data while reading a crafted ext4 filesystem
CVE-2019-13106 - August 06, 2019

Das U-Boot versions 2016.09 through 2019.07-rc4 can memset() too much data while reading a crafted ext4 filesystem, which results in a stack buffer overflow and likely code execution.

In Das U-Boot versions 2016.11-rc1 through 2019.07-rc4, an underflow
CVE-2019-13104 - August 06, 2019

In Das U-Boot versions 2016.11-rc1 through 2019.07-rc4, an underflow can cause memcpy() to overwrite a very large amount of data (including the whole stack) while reading a crafted ext4 filesystem.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14197 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is a read of out-of-bounds data at nfs_read_reply.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14192 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is an unbounded memcpy when parsing a UDP packet due to a net_process_received_packet integer underflow during an nc_input_packet call.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14193 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is an unbounded memcpy with an unvalidated length at nfs_readlink_reply, in the "if" block after calculating the new path length.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14194 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is an unbounded memcpy with a failed length check at nfs_read_reply when calling store_block in the NFSv2 case.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14195 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is an unbounded memcpy with unvalidated length at nfs_readlink_reply in the "else" block after calculating the new path length.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14196 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is an unbounded memcpy with a failed length check at nfs_lookup_reply.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14198 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is an unbounded memcpy with a failed length check at nfs_read_reply when calling store_block in the NFSv3 case.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14199 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is an unbounded memcpy when parsing a UDP packet due to a net_process_received_packet integer underflow during an *udp_packet_handler call.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14200 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is a stack-based buffer overflow in this nfs_handler reply helper function: rpc_lookup_reply.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14201 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is a stack-based buffer overflow in this nfs_handler reply helper function: nfs_lookup_reply.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14202 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is a stack-based buffer overflow in this nfs_handler reply helper function: nfs_readlink_reply.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14203 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is a stack-based buffer overflow in this nfs_handler reply helper function: nfs_mount_reply.

An issue was discovered in Das U-Boot through 2019.07
CVE-2019-14204 - July 31, 2019

An issue was discovered in Das U-Boot through 2019.07. There is a stack-based buffer overflow in this nfs_handler reply helper function: nfs_umountall_reply.