CVE-2026-74671ima: fix out-of-bounds read in xattr_verify()
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ima: fix out-of-bounds read in xattr_verify() The digest-length check in xattr_verify() mixes int and size_t: if (xattr_len - sizeof(xattr_value->type) - hash_start >= iint->ima_hash->length) sizeof() yields size_t, so the usual arithmetic conversions promote the whole left-hand side to unsigned 64-bit before the subtraction runs. For a truncated xattr this underflows instead of going negative: a 1-byte IMA_XATTR_DIGEST_NG xattr (xattr_len == 1, hash_start == 1) turns "1 - 1 - 1" into SIZE_MAX, which is trivially >= ima_hash->length. The check then passes and the following memcmp() reads iint->ima_hash->length bytes starting past the end of the buffer vfs_getxattr_alloc() allocated for it. Nothing upstream clamps xattr_len back into a safe range first: ima_get_hash_algo() only special-cases xattr_len < 2 to pick a default algorithm, and evm_verifyxattr() returns INTEGRITY_UNKNOWN rather than failing when no HMAC key is loaded, so a truncated security.ima value reaches the length check as-is. Rewrite the comparison so every operand stays a signed int and no implicit conversion to size_t can occur.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 3ea7a56067e663278470c04fd655adf809e72d4d – < d823b5f4557083d1dd92096f796a78a2b1b06d10
- affected 3ea7a56067e663278470c04fd655adf809e72d4d – < caeb105c15ea2431fa8da7ecfa242d0c68272426
- affected 3ea7a56067e663278470c04fd655adf809e72d4d – < a784b4732ac7e51862b9b210c2d8b2ab9e83568c
- affected 3ea7a56067e663278470c04fd655adf809e72d4d – < b6cb134707a2127d90a58d69dd818679cae8033c
- affected 3ea7a56067e663278470c04fd655adf809e72d4d – < 7e515b6c9aab452a4f0734bd7208e4e780e164ca
- affected 3ea7a56067e663278470c04fd655adf809e72d4d – < 27f3924061592d0ef6b04e16f48754b6cb6adf27
- affected 3ea7a56067e663278470c04fd655adf809e72d4d – < dd04114af0d451091f7b8cbd26d9e37d011e9131
- affected 3ea7a56067e663278470c04fd655adf809e72d4d – < 5ff232d31106f45ac87c3b64e1d35a0667777797
- affected 3.13
- unaffected < 3.13
- unaffected 5.10.265 – ≤ 5.10.*
- unaffected 5.15.216 – ≤ 5.15.*
- unaffected 6.1.183 – ≤ 6.1.*
- unaffected 6.6.152 – ≤ 6.6.*
- unaffected 6.12.104 – ≤ 6.12.*
- unaffected 6.18.45 – ≤ 6.18.*
- unaffected 7.1.9 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/d823b5f4557083d1dd92096f796a78a2b1b06d10 (opens in a new tab)
- https://git.kernel.org/stable/c/caeb105c15ea2431fa8da7ecfa242d0c68272426 (opens in a new tab)
- https://git.kernel.org/stable/c/a784b4732ac7e51862b9b210c2d8b2ab9e83568c (opens in a new tab)
- https://git.kernel.org/stable/c/b6cb134707a2127d90a58d69dd818679cae8033c (opens in a new tab)
- https://git.kernel.org/stable/c/7e515b6c9aab452a4f0734bd7208e4e780e164ca (opens in a new tab)
- https://git.kernel.org/stable/c/27f3924061592d0ef6b04e16f48754b6cb6adf27 (opens in a new tab)
- https://git.kernel.org/stable/c/dd04114af0d451091f7b8cbd26d9e37d011e9131 (opens in a new tab)
- https://git.kernel.org/stable/c/5ff232d31106f45ac87c3b64e1d35a0667777797 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-64358 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-74671)Record last updated .