CVE-2025-38305

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 6.15.0-rc6

Description: The Linux kernel contains a flaw within the ptp subsystem related to recursive locking. Specifically, the ptp vclock in use() function includes a check for ptp->n vclocks that can lead to a deadlock when acquiring the ptp->n vclocks mux lock, particularly during the unregistration of virtual clocks. The issue arises from a redundant check for ptp->n vclocks within the function. The call trace indicates a potential recursive lock acquisition when attempting to acquire ptp->n vclocks mux while it is already held by another part of the code.

Recommendations: Linux kernel versions prior to 6.15.0-rc6: Remove the logic that checks ptp->n vclocks in the ptp vclock in use() function.