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CVE-2026-52927

Estado: AnalizadaAlta (7.8)—

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

netfilter: ebtables: fix OOB read in compat_mtw_from_user

Luxiao Xu says:

The function compat_mtw_from_user() converts ebtables extensions from 32-bit user structures to kernel native structures. However, it lacks proper validation of the user-supplied match_size/target_size.

When certain extensions are processed, the kernel-side translation logic may perform memory accesses based on the extension's expected size. If the user provides a size smaller than what the extension requires, it results in an out-of-bounds read as reported by KASAN.

Leer descripción completaMostrar menos

This fix introduces a check to ensure match_size is at least as large as the extension's required compatsize. This covers matches, watchers, and targets, while maintaining compatibility with standard targets.

AFAIU this is relevant for matches that need to go though match->compat_from_user() call. Those that use plain memcpy with the user-provided size are ok because the caller checks that size vs the start of the next rule entry offset (which itself is checked vs. total size copied from userspace).

The ->compat_from_user() callbacks assume they can read compatsize bytes, so they need this extra check.

Based on an earlier patch from Luxiao Xu.

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.

Acceso local sin interacción (AV:L, PR:L, UI:N) permite escalada de privilegios mediante lectura fuera de límites (CWE-125 OOB read) en netfilter. Posible ejecución de código o acceso a datos del kernel.

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

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

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\nnetfilter: ebtables: fix OOB read in compat_mtw_from_user\n\nLuxiao Xu says:\n\n The function compat_mtw_from_user() converts ebtables extensions from\n 32-bit user structures to kernel native structures. However, it lacks\n proper validation of the user-supplied match_size/target_size.\n\n When certain extensions are processed, the kernel-side translation\n logic may perform memory accesses based on the extension's expected\n size. If the user provides a size smaller than what the extension\n requires, it results in an out-of-bounds read as reported by KASAN.\n\n This fix introduces a check to ensure match_size is at least as large\n as the extension's required compatsize. This covers matches, watchers,\n and targets, while maintaining compatibility with standard targets.\n\nAFAIU this is relevant for matches that need to go though\nmatch->compat_from_user() call.  Those that use plain memcpy with the\nuser-provided size are ok because the caller checks that size vs the\nstart of the next rule entry offset (which itself is checked vs. total\nsize copied from userspace).\n\nThe ->compat_from_user() callbacks assume they can read compatsize bytes,\nso they need this extra check.\n\nBased on an earlier patch from Luxiao Xu."
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