CVE-2025-21769: ptp: vmclock: Add .owner to vmclock_miscdev_fops

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-27 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ptp: vmclock: Add .owner to vmclock_miscdev_fops Without the .owner field, the module can be unloaded while /dev/vmclock0 is open, leading to an oops.

Affected products

Linux kernel: from 6.13 before 6.13.4; 6.14-rc1, 6.14-rc2 — fixed in 6.13.4

How to fix

Upgrade to a fixed version: Linux kernel 6.13.4. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/3b5709225b43ee33e1026dd1fc0949a7f19b5289
https://git.kernel.org/stable/c/7b07b040257c1b658ef3eca86e4b6ae02d65069c

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