Linux Kernel Vulnerability in RCU Torture Tests Impacting Real-Time Operations

CVE-2025-39745

What is CVE-2025-39745?

An issue has been identified in the Linux kernel's handling of real-time (RT) configurations using the RCU torture tests. When performing rcutorture tests with preemptive real-time support enabled, an unexpected warning can occur, leading to potential inconsistencies in the kernel's handling of soft interrupts. The underlying cause pertains to inappropriate count checks for bottom halves (BH), adversely affecting the stability of real-time tasks. This vulnerability necessitates careful monitoring of kernel operations to ensure uninterrupted functionality for critical real-time systems.

References