CVE-2025-21767

A vulnerability was found in the Linux kernel's clocksource subsystem, specifically affecting systems running with the PREEMPT_RT (Real-Time) patch. In real-time kernels, certain locks used within the random number generation functions, are implemented as sleeping locks. Calling these functions in an atomic context—where sleeping is not allowed—can lead to kernel warnings or crashes. The issue occurs when the get_random_u32() function is called within an atomic context, which is not permissible in real-time kernels due to the use of sleeping locks in the random number generation code.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.