drm/vc4: drain the hangcheck timer and works on V3D unbind

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Summary

CVECVE-2026-99095
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-26 15:16:48 UTC
Updated2026-10-26 15:16:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/vc4: drain the hangcheck timer and works on V3D unbind Nothing stops the hangcheck timer that submitted jobs arm, or the job_done_work that the render-done interrupt queues, at teardown: vc4_irq_disable() cancels only overflow_mem_work, and vc4_gem_destroy() runs from the drm-managed release, after vc4_v3d_unbind() has already uninstalled the V3D interrupt and cleared vc4->v3d. A timer still armed by then reads V3D registers through the NULL vc4->v3d pointer, and the late callbacks run on the vc4_dev embedding them after it has been freed. Drain them in vc4_v3d_unbind(): shut the timer down and cancel reset_work before the interrupt is taken down, because its vc4_irq_reset() re-enables it, then flush job_done_work so that completions queued at teardown still release their jobs. This issue was found by an in-house static analysis tool.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 17c5fa371de2d5508755cd4cd227cc8e2bb99240 git Not specified
CNA Linux Linux affected d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 a046cd60ff3f4a8c8e672b3b18902682c1f91731 git Not specified
CNA Linux Linux affected d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 e61465d3e0292daebf4dbb34e0add635e2439569 git Not specified
CNA Linux Linux affected d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 ade226dfd28cf2fd1dce143c556d1ee77d953696 git Not specified
CNA Linux Linux affected d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 94cf5971b1d04c6382437387c4dc3836cc7a1437 git Not specified
CNA Linux Linux affected 4.5 Not specified
CNA Linux Linux unaffected 4.5 semver Not specified
CNA Linux Linux unaffected 6.6.160 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.113 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.57 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.11 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ade226dfd28cf2fd1dce143c556d1ee77d953696 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e61465d3e0292daebf4dbb34e0add635e2439569 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/17c5fa371de2d5508755cd4cd227cc8e2bb99240 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a046cd60ff3f4a8c8e672b3b18902682c1f91731 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/94cf5971b1d04c6382437387c4dc3836cc7a1437 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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