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CVE-2026-99095

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

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed in17c5fa371de2d5508755cd4cd227cc8e2bb99240Also 94cf5971b1d04c6382437387c4dc3836cc7a1437CVE List
Published26 Oct 2026Updated 26 Oct 2026CVE List

What fixes it

  • 17c5fa371de2d5508755cd4cd227cc8e2bb99240LinuxCVE List
  • 94cf5971b1d04c6382437387c4dc3836cc7a1437LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 12

  • Linuxaffected: d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 before 17c5fa371de2d5508755cd4cd227cc8e2bb99240CVE List
  • Linuxaffected: d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 before a046cd60ff3f4a8c8e672b3b18902682c1f91731CVE List
  • Linuxaffected: d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 before e61465d3e0292daebf4dbb34e0add635e2439569CVE List
  • Linuxaffected: d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 before ade226dfd28cf2fd1dce143c556d1ee77d953696CVE List
  • Linuxaffected: d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 before 94cf5971b1d04c6382437387c4dc3836cc7a1437CVE List
  • Linuxaffected: 4.5CVE List
  • Linuxunaffected: all versions before 4.5CVE List
  • Linuxunaffected: 6.6.160 through 6.6.*CVE List
  • Linuxunaffected: 6.12.113 through 6.12.*CVE List
  • Linuxunaffected: 6.18.57 through 6.18.*CVE List
  • Linuxunaffected: 7.2.11 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5