---
id: CVE-2026-68233
title: 'drm/vc4: Shut down BO cache timer before teardown'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/vc4: Shut down BO cache timer before teardown

  The BO cache timer callback schedules time_work, and time_work can rearm
  the timer through vc4_bo_cache_free_old().

  …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c826a6e1064419f78855463cf29ce9e8b9d25bf4 <
    cf55c6f1b62a89bf365c48bf731ccf69340e3a16
  - >-
    Linux >= c826a6e1064419f78855463cf29ce9e8b9d25bf4 <
    e9264ee59bd94970b80b7548f693bccf0d4628da
  - >-
    Linux >= c826a6e1064419f78855463cf29ce9e8b9d25bf4 <
    a38f2724eb93a78ba250b01e0caf3468df4d3956
  - >-
    Linux >= c826a6e1064419f78855463cf29ce9e8b9d25bf4 <
    bac4c1a9af690b8635c6924872075c41d8763ed9
  - >-
    Linux >= c826a6e1064419f78855463cf29ce9e8b9d25bf4 <
    6273dd3ffb54ec581855b82ae77331b66028249c
  - Linux 4.5
published: '2026-08-10'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:43:34.259Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68233'
references:
  - url: 'https://git.kernel.org/stable/c/cf55c6f1b62a89bf365c48bf731ccf69340e3a16'
  - url: 'https://git.kernel.org/stable/c/e9264ee59bd94970b80b7548f693bccf0d4628da'
  - url: 'https://git.kernel.org/stable/c/a38f2724eb93a78ba250b01e0caf3468df4d3956'
  - url: 'https://git.kernel.org/stable/c/bac4c1a9af690b8635c6924872075c41d8763ed9'
  - url: 'https://git.kernel.org/stable/c/6273dd3ffb54ec581855b82ae77331b66028249c'
tags:
  - cve.org
epss: 0.00166
epssPercentile: 0.05477
ingestedAt: '2026-10-21T12:48:53.604Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

drm/vc4: Shut down BO cache timer before teardown

The BO cache timer callback schedules time_work, and time_work can rearm
the timer through vc4_bo_cache_free_old().

vc4_bo_cache_destroy() deletes the timer and then cancels the work, which
does not break that cycle: the work being cancelled can rearm the timer,
and the timer then queues work again after teardown.

Use timer_shutdown_sync() instead, so the timer cannot be rearmed and the
cycle ends with cancel_work_sync().

## Affected

- `Linux >= c826a6e1064419f78855463cf29ce9e8b9d25bf4 < cf55c6f1b62a89bf365c48bf731ccf69340e3a16`
- `Linux >= c826a6e1064419f78855463cf29ce9e8b9d25bf4 < e9264ee59bd94970b80b7548f693bccf0d4628da`
- `Linux >= c826a6e1064419f78855463cf29ce9e8b9d25bf4 < a38f2724eb93a78ba250b01e0caf3468df4d3956`
- `Linux >= c826a6e1064419f78855463cf29ce9e8b9d25bf4 < bac4c1a9af690b8635c6924872075c41d8763ed9`
- `Linux >= c826a6e1064419f78855463cf29ce9e8b9d25bf4 < 6273dd3ffb54ec581855b82ae77331b66028249c`
- `Linux 4.5`

## Remediation

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