CVE-2026-99095

In 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.