CVE-2026-46309
Full vulnerability record from the local CVENow database.
Description
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). 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)
Severity
HIGH
CVSS score
7.0
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-06-08 17:16:49.820000
Last modified
2026-11-06 17:17:55.133000
View original CVE JSON
{
"id": "CVE-2026-46309",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-06-08T17:16:49.820",
"lastModified": "2026-11-06T17:17:55.133",
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"lang": "en",
"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)"
},
{
"lang": "es",
"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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