CVE-2025-21814 ptp: Ensure info->enable callback is always set
A missing callback check in the Linux kernel PTP subsystem allows local attackers to trigger a null pointer dereference, causing a system crash.
- 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-2025-21814?
CVE-2025-21814 is a medium-severity vulnerability in Linux kernel, published on 27 Feb 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:
ptp: Ensure info->enable callback is always set
The ioctl and sysfs handlers unconditionally call the ->enable callback. Not all drivers implement that callback, leading to NULL dereferences. Example of affected drivers: ptp_s390.c, ptp_vclock.c and ptp_mock.c.
Instead use a dummy callback if no better was specified by the driver.
Weakness: CWE-476
Which versions are affected by CVE-2025-21814?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21814?
Apply the vendor's patch.
Is CVE-2025-21814 being exploited?
There is no known exploitation of CVE-2025-21814 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-57752, BELL-CVE-2025-21814, DEBIAN-CVE-2025-21814, GHSA-xxp9-gm8j-w4c9, ROOT-OS-UBUNTU-2404-CVE-2025-21814, UBUNTU-CVE-2025-21814.