Vulnerability in u-boot

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund29 Sep 2026WID-SEC-2026-3660

  DENX U-Boot: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-74221CVE-2026-74222CVE-2026-74220+5 more CVEs

[ References ]References

• github.com/u-boot/u-boot
• github.com/u-boot/u-boot/blob/v2026.07/fs/squashfs/sqfs.c
• github.com/u-boot/u-boot/commit/561ae28cb56a082cfa90c1c421c4955bc215470b
• www.vulncheck.com/advisories/u-boot-before-2026.10-rc4-integer-overflow-in-squashfs-dir…