CVE-2025-21823

CVE-2025-21823 is about batman-adv in the Linux kernel where the unmanaged ELP metric worker was dropped. The issue arose because the ELP worker, which recalculates metrics for neighbors reachable over an interface, used locks that could sleep, conflicting with the RCU list iterator and risking i...

CVE-2025-21823 batman-adv: Drop unmanaged ELP metric worker

In the Linux kernel, the following vulnerability has been resolved: batman-adv: Drop unmanaged ELP metric worker The ELP worker needs to calculate new metric values for all neighbors "reachable" over an interface. Some of the used metric sources require locks which might need to sleep. This sleep...