---
id: CVE-2026-99095
title: 'drm/vc4: drain the hangcheck timer and works on V3D unbind'
summary: |-
  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 interru…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 <
    17c5fa371de2d5508755cd4cd227cc8e2bb99240
  - >-
    Linux >= d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 <
    a046cd60ff3f4a8c8e672b3b18902682c1f91731
  - >-
    Linux >= d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 <
    e61465d3e0292daebf4dbb34e0add635e2439569
  - >-
    Linux >= d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 <
    ade226dfd28cf2fd1dce143c556d1ee77d953696
  - >-
    Linux >= d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 <
    94cf5971b1d04c6382437387c4dc3836cc7a1437
  - Linux 4.5
published: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T14:52:02.647Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-99095'
references:
  - url: 'https://git.kernel.org/stable/c/17c5fa371de2d5508755cd4cd227cc8e2bb99240'
  - url: 'https://git.kernel.org/stable/c/a046cd60ff3f4a8c8e672b3b18902682c1f91731'
  - url: 'https://git.kernel.org/stable/c/e61465d3e0292daebf4dbb34e0add635e2439569'
  - url: 'https://git.kernel.org/stable/c/ade226dfd28cf2fd1dce143c556d1ee77d953696'
  - url: 'https://git.kernel.org/stable/c/94cf5971b1d04c6382437387c4dc3836cc7a1437'
tags:
  - cve.org
ingestedAt: '2026-10-26T15:29:30.506Z'
---

## Overview

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.

## Affected

- `Linux >= d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 < 17c5fa371de2d5508755cd4cd227cc8e2bb99240`
- `Linux >= d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 < a046cd60ff3f4a8c8e672b3b18902682c1f91731`
- `Linux >= d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 < e61465d3e0292daebf4dbb34e0add635e2439569`
- `Linux >= d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 < ade226dfd28cf2fd1dce143c556d1ee77d953696`
- `Linux >= d5b1a78a772f1e31a94f8babfa964152ec5e9aa5 < 94cf5971b1d04c6382437387c4dc3836cc7a1437`
- `Linux 4.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.