# CVE-2025-39701: ACPI: pfr_update: Fix the driver update version check

> An attacker can bypass firmware update security checks by exploiting incorrect version validation logic in the Linux kernel ACPI driver.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 5 Sep 2025
- **Updated:** 12 May 2026
- **Also known as:** AZL-66998, BELL-CVE-2025-39701, DEBIAN-CVE-2025-39701, GHSA-h5w4-4xvq-qx5c, ROOT-OS-UBUNTU-2404-CVE-2025-39701, UBUNTU-CVE-2025-39701

## What is CVE-2025-39701?

CVE-2025-39701 is a high-severity vulnerability in Debian Debian Linux, published on 5 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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 ]

## Which versions are affected by CVE-2025-39701?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2025-39701?

Apply the vendor's patch.

## Is CVE-2025-39701 being exploited?

There is no known exploitation of CVE-2025-39701 in the wild and no public exploit code.

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## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-39701 and fix it if it is affected.

What it is: CVE-2025-39701 is a high-severity vulnerability in Debian Debian Linux, published on 5 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-39701 in the wild and no public exploit code.

Affected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-39701/ (Markdown: https://insights.sbomify.com/CVE-2025-39701/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-39701
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-39701
- OSV: https://osv.dev/vulnerability/CVE-2025-39701

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-39701/
Summaries are generated and may contain mistakes; the official description above is the record.