CVE-2026-74671
Estado: RecibidaSin puntuar—
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:
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.
Leer descripción completaMostrar menos
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.
Detalles técnicos trazas, registros y código del informe original
if (xattr_len - sizeof(xattr_value->type) - hash_start >= iint->ima_hash->length)
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.22%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/27f3924061592d0ef6b04e16f48754b6cb6adf27
- https://git.kernel.org/stable/c/5ff232d31106f45ac87c3b64e1d35a0667777797
- https://git.kernel.org/stable/c/7e515b6c9aab452a4f0734bd7208e4e780e164ca
- https://git.kernel.org/stable/c/a784b4732ac7e51862b9b210c2d8b2ab9e83568c
- https://git.kernel.org/stable/c/b6cb134707a2127d90a58d69dd818679cae8033c
- https://git.kernel.org/stable/c/caeb105c15ea2431fa8da7ecfa242d0c68272426
- https://git.kernel.org/stable/c/d823b5f4557083d1dd92096f796a78a2b1b06d10
- https://git.kernel.org/stable/c/dd04114af0d451091f7b8cbd26d9e37d011e9131
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-74671",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
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{
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},
{
"status": "unaffected",
"version": "0",
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{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
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},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
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},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
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},
{
"status": "unaffected",
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"versionType": "semver",
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{
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"version": "6.18.45",
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{
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],
"published": "2026-08-22T16:16:41.063",
"references": [
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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},
{
"url": "https://git.kernel.org/stable/c/caeb105c15ea2431fa8da7ecfa242d0c68272426",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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{
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dd04114af0d451091f7b8cbd26d9e37d011e9131",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nima: fix out-of-bounds read in xattr_verify()\n\nThe digest-length check in xattr_verify() mixes int and size_t:\n\n\tif (xattr_len - sizeof(xattr_value->type) - hash_start >=\n\t\t\tiint->ima_hash->length)\n\nsizeof() yields size_t, so the usual arithmetic conversions promote\nthe whole left-hand side to unsigned 64-bit before the subtraction\nruns. For a truncated xattr this underflows instead of going negative:\na 1-byte IMA_XATTR_DIGEST_NG xattr (xattr_len == 1, hash_start == 1)\nturns \"1 - 1 - 1\" into SIZE_MAX, which is trivially >= ima_hash->length.\nThe check then passes and the following memcmp() reads\niint->ima_hash->length bytes starting past the end of the buffer\nvfs_getxattr_alloc() allocated for it.\n\nNothing upstream clamps xattr_len back into a safe range first:\nima_get_hash_algo() only special-cases xattr_len < 2 to pick a default\nalgorithm, and evm_verifyxattr() returns INTEGRITY_UNKNOWN rather than\nfailing when no HMAC key is loaded, so a truncated security.ima value\nreaches the length check as-is.\n\nRewrite the comparison so every operand stays a signed int and no\nimplicit conversion to size_t can occur."
}
],
"lastModified": "2026-08-22T16:16:41.063",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}