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CVE-2026-53004

Estado: AnalizadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

sctp: fix OOB write to userspace in sctp_getsockopt_peer_auth_chunks

sctp_getsockopt_peer_auth_chunks() checks that the caller's optval buffer is large enough for the peer AUTH chunk list with

but then writes num_chunks bytes to p->gauth_chunks, which lives at offset offsetof(struct sctp_authchunks, gauth_chunks) == 8 inside optval. The check is missing the sizeof(struct sctp_authchunks) = 8-byte header. When the caller supplies len == num_chunks (for any num_chunks > 0) the test passes but copy_to_user() writes sizeof(struct sctp_authchunks) = 8 bytes past the declared buffer.

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The sibling function sctp_getsockopt_local_auth_chunks() at the next line already has the correct check:

Align the peer variant with its sibling.

Reproducer confirms on v7.0-13-generic: an unprivileged userspace caller that opens a loopback SCTP association with AUTH enabled, queries num_chunks with a short optval, then issues the real getsockopt with len == num_chunks and sentinel bytes painted past the buffer observes those sentinel bytes overwritten with the peer's AUTH chunk type. The bytes written are under the peer's control but land in the caller's own userspace; this is not a kernel memory corruption, but it is a kernel-side contract violation that can silently corrupt adjacent userspace data.

Detalles técnicos trazas, registros y código del informe original
    if (len < num_chunks)
            return -EINVAL;

    if (len < sizeof(struct sctp_authchunks) + num_chunks)
            return -EINVAL;

CVSS

Probabilidad de explotación (EPSS)

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.

Vulnerabilidad local (AV:L/PR:L) que permite escritura fuera de límites (CWE-787) en buffer de usuario, corrompiendo datos adyacentes; requiere privs locales mínimas, sin interacción. Posibilita corrupción de datos de aplicación (T1565.001) o potencial DoS por corrupción de estado.

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

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix OOB write to userspace in sctp_getsockopt_peer_auth_chunks\n\nsctp_getsockopt_peer_auth_chunks() checks that the caller's optval\nbuffer is large enough for the peer AUTH chunk list with\n\n    if (len < num_chunks)\n            return -EINVAL;\n\nbut then writes num_chunks bytes to p->gauth_chunks, which lives\nat offset offsetof(struct sctp_authchunks, gauth_chunks) == 8\ninside optval.  The check is missing the sizeof(struct\nsctp_authchunks) = 8-byte header.  When the caller supplies\nlen == num_chunks (for any num_chunks > 0) the test passes but\ncopy_to_user() writes sizeof(struct sctp_authchunks) = 8 bytes\npast the declared buffer.\n\nThe sibling function sctp_getsockopt_local_auth_chunks() at the\nnext line already has the correct check:\n\n    if (len < sizeof(struct sctp_authchunks) + num_chunks)\n            return -EINVAL;\n\nAlign the peer variant with its sibling.\n\nReproducer confirms on v7.0-13-generic: an unprivileged userspace\ncaller that opens a loopback SCTP association with AUTH enabled,\nqueries num_chunks with a short optval, then issues the real\ngetsockopt with len == num_chunks and sentinel bytes painted past\nthe buffer observes those sentinel bytes overwritten with the\npeer's AUTH chunk type.  The bytes written are under the peer's\ncontrol but land in the caller's own userspace; this is not a\nkernel memory corruption, but it is a kernel-side contract\nviolation that can silently corrupt adjacent userspace data."
    }
  ],
  "lastModified": "2026-07-14T20:05:22.253",
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