CVE-2026-23466

Estado: AnalizadaAlta (7.8)—

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

drm/xe: Open-code GGTT MMIO access protection

GGTT MMIO access is currently protected by hotplug (drm_dev_enter), which works correctly when the driver loads successfully and is later unbound or unloaded. However, if driver load fails, this protection is insufficient because drm_dev_unplug() is never called.

Additionally, devm release functions cannot guarantee that all BOs with GGTT mappings are destroyed before the GGTT MMIO region is removed, as some BOs may be freed asynchronously by worker threads.

To address this, introduce an open-coded flag, protected by the GGTT lock, that guards GGTT MMIO access. The flag is cleared during the dev_fini_ggtt devm release function to ensure MMIO access is disabled once teardown begins.

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(cherry picked from commit 4f3a998a173b4325c2efd90bdadc6ccd3ad9a431)

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.13%
Percentil entre todas las CVEs puntuadas: 2
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1005 Data from Local Systemcollection60 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact55 %

Acceso local sin interacción (AV:L/PR:L/UI:N) en kernel permite escalada de privilegios. Lectura/corrupción de memoria GGTT sin protección tras fallo de carga del driver.

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 Program Restrict File and Directory Permissions Remote Data Storage Execution Prevention Encrypt Sensitive Information Application Isolation and Sandboxing

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

NVD-CWE-noinfo

Referencias

JSON original (NVD)

Mostrar

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: Open-code GGTT MMIO access protection\n\nGGTT MMIO access is currently protected by hotplug (drm_dev_enter),\nwhich works correctly when the driver loads successfully and is later\nunbound or unloaded. However, if driver load fails, this protection is\ninsufficient because drm_dev_unplug() is never called.\n\nAdditionally, devm release functions cannot guarantee that all BOs with\nGGTT mappings are destroyed before the GGTT MMIO region is removed, as\nsome BOs may be freed asynchronously by worker threads.\n\nTo address this, introduce an open-coded flag, protected by the GGTT\nlock, that guards GGTT MMIO access. The flag is cleared during the\ndev_fini_ggtt devm release function to ensure MMIO access is disabled\nonce teardown begins.\n\n(cherry picked from commit 4f3a998a173b4325c2efd90bdadc6ccd3ad9a431)"
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/xe: Implementación directa de la protección de acceso MMIO de GGTT\n\nEl acceso MMIO de GGTT está actualmente protegido por hotplug (drm_dev_enter), lo que funciona correctamente cuando el controlador se carga con éxito y luego se desvincula o descarga. Sin embargo, si la carga del controlador falla, esta protección es insuficiente porque drm_dev_unplug() nunca se llama.\n\nAdemás, las funciones de liberación de devm no pueden garantizar que todos los BOs con mapeos de GGTT sean destruidos antes de que se elimine la región MMIO de GGTT, ya que algunos BOs pueden ser liberados asincrónicamente por hilos de trabajo.\n\nPara abordar esto, se introduce un indicador de codificación directa, protegido por el bloqueo de GGTT, que protege el acceso MMIO de GGTT. El indicador se borra durante la función de liberación de devm dev_fini_ggtt para asegurar que el acceso MMIO se deshabilite una vez que comienza el desmantelamiento.\n\n(seleccionado de la confirmación 4f3a998a173b4325c2efd90bdadc6ccd3ad9a431)"
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