CVE-2026-71973

Name	CVE-2026-71973
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
u-boot (PTS)	bookworm, bookworm (security)	2023.01+dfsg-2+deb12u3	vulnerable
	trixie	2025.01-3+deb13u1	vulnerable
	forky, sid	2025.01-3.2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
u-boot	source	(unstable)	(unfixed)

Notes

Introduced with: https://github.com/u-boot/u-boot/commit/c51006130370b48b7eb5a93ada745385aa27f6bf (v2020.10-rc2)
Fixed by: https://github.com/u-boot/u-boot/commit/561ae28cb56a082cfa90c1c421c4955bc215470b (v2026.10-rc4)