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CVE-2026-74671: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    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.

    Засегнати продукти

    • Linux Linux: 3ea7a56067e663278470c04fd655adf809e72d4d преди d823b5f4557083d1dd92096f796a78a2b1b06d10; 3ea7a56067e663278470c04fd655adf809e72d4d преди caeb105c15ea2431fa8da7ecfa242d0c68272426; 3ea7a56067e663278470c04fd655adf809e72d4d преди a784b4732ac7e51862b9b210c2d8b2ab9e83568c; 3ea7a56067e663278470c04fd655adf809e72d4d преди b6cb134707a2127d90a58d69dd818679cae8033c; 3ea7a56067e663278470c04fd655adf809e72d4d преди 7e515b6c9aab452a4f0734bd7208e4e780e164ca; 3ea7a56067e663278470c04fd655adf809e72d4d преди 27f3924061592d0ef6b04e16f48754b6cb6adf27; 3ea7a56067e663278470c04fd655adf809e72d4d преди dd04114af0d451091f7b8cbd26d9e37d011e9131; 3ea7a56067e663278470c04fd655adf809e72d4d преди 5ff232d31106f45ac87c3b64e1d35a0667777797
    • Linux Linux: 3.13; преди 3.13; 5.10.265 до 5.10.*; 5.15.216 до 5.15.*; 6.1.183 до 6.1.*; 6.6.152 до 6.6.*; 6.12.104 до 6.12.*; 6.18.45 до 6.18.*; 7.1.9 до 7.1.*; 7.2 до *

    История

    • 22 август 2026 Публикувано

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    CVE-2026-74671: Linux | freedomonline.bg