CVE-2026-31407
Estado: ModificadaAlta (7.1)—
In the Linux kernel, the following vulnerability has been resolved:
netfilter: conntrack: add missing netlink policy validations
Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.
These attributes are used by the kernel without any validation. Extend the netlink policies accordingly.
Detalles técnicos trazas, registros y código del informe original
Quoting the reporter: nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE value directly to ct->proto.sctp.state without checking that it is within the valid range. [..] and: ... with exp->dir = 100, the access at ct->master->tuplehash[100] reads 5600 bytes past the start of a 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by UBSAN.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Puntuación base: 7.1
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.17%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 5/10/2026
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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1005Data from Local Systemcollection75 %
Acceso local sin interacción de usuario (AV:L, UI:N, PR:L) permite escalada de privilegios mediante validación ausente de atributos netlink en el kernel Linux, causando lecturas fuera de límites que exponen datos en memoria.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-787
Referencias
- https://git.kernel.org/stable/c/0fbae1e74493d5a160a70c51aeba035d8266ea7d
- https://git.kernel.org/stable/c/67c53c1978cef3c504237275e39c857e2f6af56e
- https://git.kernel.org/stable/c/78bba9f73942aa7dca47d817d8cec0fb9b443b70
- https://git.kernel.org/stable/c/9174d28f3f15d8c4962f5980c0be167633880443
- https://git.kernel.org/stable/c/be88a337bf07afb1ee173f1099294d1b7ab3fefe
- https://git.kernel.org/stable/c/c5e918390002edf0cff80a0e7ce1f86f16a9507c
- https://git.kernel.org/stable/c/e7b5766693477c52424cc6c79dd30a7a9c7db52c
- https://git.kernel.org/stable/c/f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: add missing netlink policy validations\n\nHyunwoo Kim reports out-of-bounds access in sctp and ctnetlink.\n\nThese attributes are used by the kernel without any validation.\nExtend the netlink policies accordingly.\n\nQuoting the reporter:\n nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE\n value directly to ct->proto.sctp.state without checking that it is\n within the valid range. [..]\n\n and: ... with exp->dir = 100, the access at\n ct->master->tuplehash[100] reads 5600 bytes past the start of a\n 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by\n UBSAN."
},
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: conntrack: añadir validaciones de políticas netlink faltantes\n\nHyunwoo Kim informa de acceso fuera de límites en sctp y ctnetlink.\n\nEstos atributos son utilizados por el kernel sin ninguna validación.\nExtender las políticas netlink en consecuencia.\n\nCitando al informante:\n 'nlattr_to_sctp() asigna el valor CTA_PROTOINFO_SCTP_STATE proporcionado por el usuario\n directamente a ct -> proto.sctp.state sin comprobar que esté\n dentro del rango válido. [..]\n\n y: ... con exp -> dir = 100, el acceso en\n ct -> master -> tuplehash[100] lee 5600 bytes más allá del inicio de un\n objeto nf_conn de 320 bytes, causando una lectura fuera de límites de slab confirmada por\n UBSAN.'"
}
],
"lastModified": "2026-07-24T22:10:00.140",
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