CVE-2026-52951
Estado: AnalizadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
drm/xe/dma-buf: handle empty bo and UAF races
There look to be some nasty races here when triggering the invalidate_mappings hook:
To fix this, move the attach step until after we actually have a fully set up buffer object. Note that the bo is not published to userspace until later, so not sure what the comment "Don't publish the bo until we have a valid attachment", is referring to.
We have at least two different customers reporting hitting a NULL ptr deref in evict_flags when importing something from amdgpu, followed by triggering the evict flow. Hit rate is also pretty low, which would hint at some kind of race, so something like 1) or 2) might explain this.
Leer descripción completaMostrar menos
(cherry picked from commit af1f2ad0c59fe4e2f924c526f66e968289d77971)
Detalles técnicos trazas, registros y código del informe original
1) We do xe_bo_alloc() followed by the attach, before the actual full bo init step in xe_dma_buf_init_obj(). However the bo is visible on the attachments list after the attach. This is bad since exporter driver, say amdgpu, can at any time call back into our invalidate_mappings hook, with an empty/bogus bo, leading to potential bugs/crashes. 2) Similar to 1) but here we get a UAF, when the invalidate_mappings hook is triggered. For example, we get as far as xe_bo_init_locked() but this fails in some way. But here the bo will be freed on error, but we still have it attached from dma-buf pov, so if the invalidate_mappings is now triggered then the bo we access is gone and we trigger UAF and more bugs/crashes. v2: - Shuffle the order of the ops slightly (no functional change) - Improve the comment to better explain the ordering (Matt B)
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: 0.18%
- Percentil entre todas las CVEs puntuadas: 7
- 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.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation75 % - Impacto principal
T1059Command and Scripting Interpreterexecution65 %
Acceso local (AV:L) sin interacción (UI:N) con privilegios (PR:L) permite escalada o ejecución de código tras UAF/NULL deref en kernel DRM/xe al manipular invalidate_mappings en dma-buf.
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
Tecnologías afectadas (1)
CWE
- CWE-416
- CWE-476
Referencias
- https://git.kernel.org/stable/c/20a99ea1e2fd720856d6ba497ff26b82c604751f
- https://git.kernel.org/stable/c/981bedbbe61364fcc3a3b87ebaf648a66cd07108
- https://git.kernel.org/stable/c/9894731e513019df22a29e5c52f1c98890355ff1
- https://git.kernel.org/stable/c/c473ae25421fddc3dde247ba7b85225b10641d09
- https://access.redhat.com/security/cve/CVE-2026-52951
- https://bugzilla.redhat.com/show_bug.cgi?id=2492353
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52951.json
JSON original (NVD)
Mostrar
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