CVE-2025-38083: 
Linux Kernel vulnerability analysis and mitigation

A race condition vulnerability has been identified in the Linux kernel's PRIO scheduler component, tracked as CVE-2025-38083. The vulnerability was discovered by Gerrard Tai and affects the prio_tune() function. The issue occurs when the SFQ perturb timer fires at an inopportune time, creating a race condition between CPU operations that can lead to a parent's qlen underflow (NVD).

The race condition manifests in the following sequence between two CPUs: CPU 0 performs lock root, qdisctreeflushbacklog(), and unlock root operations, while CPU 1 executes lock root, rehash, and qdisctreereducebacklog() operations. This sequence can result in a parent's qlen underflow. The fix involves replacing qdisctreeflushbacklog() with qdiscpurge_queue() to ensure all packets are purged from the qdisc before releasing the lock (NVD).

The vulnerability can be exploited to cause a parent's qlen underflow in the Linux kernel's network scheduler, potentially affecting network traffic management and system stability (NVD).

The vulnerability has been resolved by modifying the code to use qdiscpurgequeue() instead of qdisctreeflush_backlog(), ensuring that all packets are purged from the qdisc before the lock is released (NVD).