CVE-2026-98405
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:
smb: client: corregir la falta de comprobación de límites de iov en parse_posix_sids()
En parse_posix_sids(), sidsbuf_end se calcula usando out_len, suministrado por el servidor, sin validarlo frente a la longitud real del iov recibido (iov_len).
Si un servidor proporciona un out_len inflado, sidsbuf_end apuntará más allá del final del iov. Esto anula las protecciones de límites de posix_info_sid_size(), permitiendo lecturas fuera de límites en memoria del kernel adyacente.
Para corregirlo, se rechazan las respuestas en las que el sidsbuf_end calculado superaría los límites del iov recibido o provocaría un desbordamiento del puntero (wraparound).
Traducción automática del texto original de NVD (en inglés).
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
- 0.21 %
- Percentil entre todas las CVEs puntuadas
- 10
- Fecha de la puntuación
- 21/10/2026
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
Mostrar las 5 referencias
- https://git.kernel.org/stable/c/2f8ed71aaaba3bc8b19cd9930cc62e63e142b299
- https://git.kernel.org/stable/c/b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc
- https://git.kernel.org/stable/c/b862996e5105be1293da9cdc85da77b76021c3bd
- https://git.kernel.org/stable/c/d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644
- https://git.kernel.org/stable/c/eac6917a42899aad0617bbf04798c5dd946a1fe5
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-98405",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a90f37e3d7acfd9824f162830583bbf7846fe252",
"lessThan": "d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644",
"versionType": "git"
},
{
"status": "affected",
"version": "858e74876c5cbff1dfd5bace99e32fbce2abd4b5",
"lessThan": "b862996e5105be1293da9cdc85da77b76021c3bd",
"versionType": "git"
},
{
"status": "affected",
"version": "858e74876c5cbff1dfd5bace99e32fbce2abd4b5",
"lessThan": "2f8ed71aaaba3bc8b19cd9930cc62e63e142b299",
"versionType": "git"
},
{
"status": "affected",
"version": "858e74876c5cbff1dfd5bace99e32fbce2abd4b5",
"lessThan": "eac6917a42899aad0617bbf04798c5dd946a1fe5",
"versionType": "git"
},
{
"status": "affected",
"version": "858e74876c5cbff1dfd5bace99e32fbce2abd4b5",
"lessThan": "b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.32",
"lessThan": "6.6.158",
"versionType": "semver"
}
],
"programFiles": [
"fs/smb/client/smb2inode.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/smb2inode.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-14T14:17:51.603",
"references": [
{
"url": "https://git.kernel.org/stable/c/2f8ed71aaaba3bc8b19cd9930cc62e63e142b299",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b862996e5105be1293da9cdc85da77b76021c3bd",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/eac6917a42899aad0617bbf04798c5dd946a1fe5",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix missing iov bounds check in parse_posix_sids()\n\nIn parse_posix_sids(), sidsbuf_end is calculated using the server-supplied\nout_len without being validated against the actual length of the received\niov (iov_len).\n\nIf a server provides an inflated out_len, sidsbuf_end will point past the\nend of the iov. This defeats the bounds guards in posix_info_sid_size(),\nallowing out-of-bounds reads into adjacent kernel memory.\n\nFix this by rejecting responses where the calculated sidsbuf_end would\nexceed the received iov boundaries or cause pointer wraparound."
}
],
"lastModified": "2026-10-19T14:17:09.017",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}