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CVE-2025-22039

Estado: ModificadaAlta (7.1)—

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

ksmbd: fix overflow in dacloffset bounds check

The dacloffset field was originally typed as int and used in an unchecked addition, which could overflow and bypass the existing bounds check in both smb_check_perm_dacl() and smb_inherit_dacl().

This could result in out-of-bounds memory access and a kernel crash when dereferencing the DACL pointer.

This patch converts dacloffset to unsigned int and uses check_add_overflow() to validate access to the DACL.

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 de desbordamiento de buffer en ksmbd (servidor SMB del kernel) con acceso local privilegiado (PR:L). El overflow en dacloffset permite esquivar la validación de limites y acceder a memoria fuera de rango, causando crash del kernel (DoS) o potencial ejecución de código en contexto de k

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 InstallationFilter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-22039",
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          "value": "CWE-125"
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          "value": "CWE-190"
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    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix overflow in dacloffset bounds check\n\nThe dacloffset field was originally typed as int and used in an\nunchecked addition, which could overflow and bypass the existing\nbounds check in both smb_check_perm_dacl() and smb_inherit_dacl().\n\nThis could result in out-of-bounds memory access and a kernel crash\nwhen dereferencing the DACL pointer.\n\nThis patch converts dacloffset to unsigned int and uses\ncheck_add_overflow() to validate access to the DACL."
    },
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: corrección de desbordamiento en la comprobación de los límites de dacloffset. El campo dacloffset se tipificó originalmente como int y se usó en una adición sin comprobar, lo que podría desbordarse y omitir la comprobación de los límites existente tanto en smb_check_perm_dacl() como en smb_inherit_dacl(). Esto podría provocar un acceso a memoria fuera de los límites y un fallo del kernel al desreferenciar el puntero DACL. Este parche convierte dacloffset a unsigned int y utiliza check_add_overflow() para validar el acceso a la DACL."
    }
  ],
  "lastModified": "2026-09-14T12:17:35.030",
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