CVE-2026-64099

Estado: AnalizadaAlta (7.8)—

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

drm/v3d: Fix use-after-free of CPU job query arrays on error path

The CPU job ioctl's fail label calls kvfree() on cpu_job's timestamp and performance query arrays after v3d_job_cleanup(), which drops the job's last reference and frees cpu_job. Reading cpu_job at that point is a use-after-free. Also, on the early v3d_job_init() failure path, it is a NULL dereference, since v3d_job_deallocate() zeroes the local pointer.

In the success path, the arrays are released from the scheduler's .free_job callback, but on the error path, they are freed manually, as the job was never pushed to the scheduler. While the success path deals with this correctly, the fail path doesn't.

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On top of that, the manual kvfree() calls only free the array storage; they don't drm_syncobj_put() the per-query syncobjs that v3d_timestamp_query_info_free() and v3d_performance_query_info_free() release on the success path. So the same fail path that triggers the use-after-free also leaks one syncobj reference per query.

Unify the CPU job teardown into the CPU job's kref destructor, mirroring v3d_render_job_free(). The scheduler's .free_job slot reverts to the generic v3d_sched_job_free() and the fail label drops the manual kvfree() calls, leaving a single teardown path that is reached from both the scheduler and the ioctl error path. That removes the use-after-free, the NULL dereference, and the syncobj leak by construction.

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 principalT1059 Command and Scripting Interpreterexecution60 %
Impacto secundarioT1499.004 Application or System Exploitationimpact55 %

CWE-416 (use-after-free) en controlador DRM del kernel Linux con acceso local sin interacción (AV:L/PR:L/UI:N) permite escalada de privilegios. La ejecución de código arbitrario y el DoS del kernel derivan de la corrupción de memoria tras la liberación prematura.

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 Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Filter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/v3d: Fix use-after-free of CPU job query arrays on error path\n\nThe CPU job ioctl's fail label calls kvfree() on cpu_job's timestamp and\nperformance query arrays after v3d_job_cleanup(), which drops the job's\nlast reference and frees cpu_job. Reading cpu_job at that point is a\nuse-after-free. Also, on the early v3d_job_init() failure path, it is a\nNULL dereference, since v3d_job_deallocate() zeroes the local pointer.\n\nIn the success path, the arrays are released from the scheduler's\n.free_job callback, but on the error path, they are freed manually, as\nthe job was never pushed to the scheduler. While the success path deals\nwith this correctly, the fail path doesn't.\n\nOn top of that, the manual kvfree() calls only free the array storage;\nthey don't drm_syncobj_put() the per-query syncobjs that\nv3d_timestamp_query_info_free() and v3d_performance_query_info_free()\nrelease on the success path. So the same fail path that triggers the\nuse-after-free also leaks one syncobj reference per query.\n\nUnify the CPU job teardown into the CPU job's kref destructor, mirroring\nv3d_render_job_free(). The scheduler's .free_job slot reverts to the\ngeneric v3d_sched_job_free() and the fail label drops the manual\nkvfree() calls, leaving a single teardown path that is reached from both\nthe scheduler and the ioctl error path. That removes the use-after-free,\nthe NULL dereference, and the syncobj leak by construction."
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