CVE-2026-74671

CVE CVE-2026-74671EUVD EUVD-2026-64358Published 2026-08-22T15:32:41.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 3ea7a56067e663278470c04fd655adf809e72d4d <7e515b6c9aab452a4f0734bd7208e4e780e164ca; patch: 7.2; 3.13; 3ea7a56067e663278470c04fd655adf809e72d4d <d823b5f4557083d1dd92096f796a78a2b1b06d10; 3ea7a56067e663278470c04fd655adf809e72d4d <a784b4732ac7e51862b9b210c2d8b2ab9e83568c; 3ea7a56067e663278470c04fd655adf809e72d4d <b6cb134707a2127d90a58d69dd818679cae8033c; patch: 6.18.45; patch: 0; patch: 6.1.183; patch: 5.10.265; patch: 5.15.216; 3ea7a56067e663278470c04fd655adf809e72d4d <dd04114af0d451091f7b8cbd26d9e37d011e9131; patch: 6.12.104; 3ea7a56067e663278470c04fd655adf809e72d4d <5ff232d31106f45ac87c3b64e1d35a0667777797; patch: 7.1.9; 3ea7a56067e663278470c04fd655adf809e72d4d <caeb105c15ea2431fa8da7ecfa242d0c68272426; 3ea7a56067e663278470c04fd655adf809e72d4d <27f3924061592d0ef6b04e16f48754b6cb6adf27; patch: 6.6.152

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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