CVE-2026-71973
MEDIUMCVSS 5.2Description
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.
Timeline
Published:September 29th, 2026 10:18 PM
Last modified:September 30th, 2026 4:40 PM
CVSS Scoring
CVSS v3: 5.2 (MEDIUM)
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- https://github.com/u-boot/u-boot
- https://github.com/u-boot/u-boot/blob/v2026.07/fs/squashfs/sqfs.c#L814
- https://github.com/u-boot/u-boot/commit/561ae28cb56a082cfa90c1c421c4955bc215470b
- https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc4-integer-overflow-in-squashfs-directory-table-allocation
Source: NIST NVD · Data may lag official sources by up to one minute