U-Boot vulnerabilities

There exists an unchecked length field in U-Boot that can lead to memory corruption. The DFU implementation in U-Boot does not bound the length field in USB DFU download setup packets, allowing an attacker to send a packet with a length greater than 4096 bytes.

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.

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.

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 NFS server to overflow the 2048-byte nfs_path_buff buffer by returning multiple relative symlink targets without cumulative length validation.

Vulnerability in U-Boot up to version 2026.04-rc3 in the tcp_rx_state_machine() function in net/tcp.c. Sending a crafted TCP SYN+ACK packet with a manipulated data offset field causes an integer underflow, leading to bootloader crash and potential memory corruption.

In U-Boot through 2026.04-rc3, an out-of-bounds read vulnerability exists in tcp_rx_state_machine() (net/tcp.c) when CONFIG_PROT_TCP is enabled. A remote attacker can craft a malicious packet with mismatched IP total length and TCP data offset field, causing reads beyond TCP segment boundaries and potentially disrupting connection state.

An issue in the U-Boot component of GNCC GP5 v7.1.76 allows physically-proximate attackers to bypass authentication and gain root access via interrupting the boot sequence and injecting a crafted string into the kernel boot arguments.