{"id":"CVE-2026-71973","title":"U-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer","summary":"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…","severity":"medium","cvss":5.2,"cvssVector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","cwe":["CWE-190"],"vendor":"u-boot","product":"u-boot","affected":["u-boot < 2026.10-rc4"],"published":"2026-09-29","updated":"2026-09-29","sourceUpdated":"2026-09-29T22:18:22.080","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71973","references":[{"url":"https://github.com/u-boot/u-boot","label":"disclosure@vulncheck.com"},{"url":"https://github.com/u-boot/u-boot/blob/v2026.07/fs/squashfs/sqfs.c#L814","label":"disclosure@vulncheck.com"},{"url":"https://github.com/u-boot/u-boot/commit/561ae28cb56a082cfa90c1c421c4955bc215470b","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc4-integer-overflow-in-squashfs-directory-table-allocation","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-29T21:49:08.270Z","slug":"CVE-2026-71973","body":"## Overview\n\nU-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":28.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}