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

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Summary

CVECVE-2026-64099
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:50 UTC
Updated2026-07-19 16:17:50 UTC
DescriptionIn 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. 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9ba0ff3e083f6a4a0b6698f06bfff74805fefa5f acd55ea40d03e06f20a9986363019e0e5173990e git Not specified
CNA Linux Linux affected 9ba0ff3e083f6a4a0b6698f06bfff74805fefa5f 0f8efc45740b0628a787d1b0be8a0ddabd700625 git Not specified
CNA Linux Linux affected 9ba0ff3e083f6a4a0b6698f06bfff74805fefa5f 69c2a1fec2e7ca25598180816f3bc56e1842eb41 git Not specified
CNA Linux Linux affected 9ba0ff3e083f6a4a0b6698f06bfff74805fefa5f b0fe80c0b9250b35e2211bf3117e7aca814a21b0 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/69c2a1fec2e7ca25598180816f3bc56e1842eb41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f8efc45740b0628a787d1b0be8a0ddabd700625 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b0fe80c0b9250b35e2211bf3117e7aca814a21b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/acd55ea40d03e06f20a9986363019e0e5173990e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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