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CVE-2026-46309

Estado: AnalizadaAlta (7)—

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

drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise

Add validation in xe_vm_madvise_ioctl() to reject PAT indices with XE_COH_NONE coherency mode when applied to CPU cached memory.

Using coh_none with CPU cached buffers is a security issue. When the kernel clears pages before reallocation, the clear operation stays in CPU cache (dirty). GPU with coh_none can bypass CPU caches and read stale sensitive data directly from DRAM, potentially leaking data from previously freed pages of other processes.

This aligns with the existing validation in vm_bind path (xe_vm_bind_ioctl_validate_bo).

Leer descripción completaMostrar menos

v2(Matthew brost) - Add fixes - Move one debug print to better place

v3(Matthew Auld) - Should be drm/xe/uapi - More Cc

v4(Shuicheng Lin) - Fix kmem leak issues by the way

v5 - Remove kmem leak because it has been merged by another patch

v6 - Remove the fix which is not related to current fix

v7 - No change

v8 - Rebase

v9 - Limit the restrictions to iGPU

v10 - No change

(cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)

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 leer datos sensibles de memoria (stale data from DRAM). GPU con coherencia nula (coh_none) accede al bus de memoria principal omitiendo cachés, exfiltrando datos de procesos anteriores. Requiere acceso local con privilegios de usuario.

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 ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

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\ndrm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise\n\nAdd validation in xe_vm_madvise_ioctl() to reject PAT indices with\nXE_COH_NONE coherency mode when applied to CPU cached memory.\n\nUsing coh_none with CPU cached buffers is a security issue. When the\nkernel clears pages before reallocation, the clear operation stays in\nCPU cache (dirty). GPU with coh_none can bypass CPU caches and read\nstale sensitive data directly from DRAM, potentially leaking data from\npreviously freed pages of other processes.\n\nThis aligns with the existing validation in vm_bind path\n(xe_vm_bind_ioctl_validate_bo).\n\nv2(Matthew brost)\n- Add fixes\n- Move one debug print to better place\n\nv3(Matthew Auld)\n- Should be drm/xe/uapi\n- More Cc\n\nv4(Shuicheng Lin)\n- Fix kmem leak issues by the way\n\nv5\n- Remove kmem leak because it has been merged by another patch\n\nv6\n- Remove the fix which is not related to current fix\n\nv7\n- No change\n\nv8\n- Rebase\n\nv9\n- Limit the restrictions to iGPU\n\nv10\n- No change\n\n(cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)"
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/xe/uapi: Rechazar el índice PAT coh_none para memoria caché de CPU en madvise\n\nAñadir validación en xe_vm_madvise_ioctl() para rechazar índices PAT con modo de coherencia XE_COH_NONE cuando se aplica a memoria caché de CPU.\n\nUsar coh_none con búferes en caché de CPU es un problema de seguridad. Cuando el kernel borra páginas antes de la reasignación, la operación de borrado permanece en la caché de la CPU (sucia). La GPU con coh_none puede omitir las cachés de la CPU y leer datos sensibles obsoletos directamente de la DRAM, potencialmente filtrando datos de páginas previamente liberadas de otros procesos.\n\nEsto se alinea con la validación existente en la ruta vm_bind (xe_vm_bind_ioctl_validate_bo).\n\nv2(Matthew brost)\n- Añadir correcciones\n- Mover una impresión de depuración a un lugar mejor\n\nv3(Matthew Auld)\n- Debería ser drm/xe/uapi\n- Más Cc\n\nv4(Shuicheng Lin)\n- Corregir problemas de fuga de kmem de paso\n\nv5\n- Eliminar la fuga de kmem porque ha sido fusionada por otro parche\n\nv6\n- Eliminar la corrección que no está relacionada con la corrección actual\n\nv7\n- Sin cambios\n\nv8\n- Rebase\n\nv9\n- Limitar las restricciones a la iGPU\n\nv10\n- Sin cambios\n\n(seleccionado de la confirmación 016ccdb674b8c899940b3944952c96a6a490d10a)"
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