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.
- 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
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 include 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.
Other vulnerabilities in Debian Debian Linux
Sources
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.