CVE-2026-80519
CriticalCVSS 9.8Summary
In the Linux kernel, the ovpn driver's crypto completion callbacks hold references to the key slot and peer. If the peer reference is released before the callback finishes, it can lead to use-after-free or scheduling an RCU callback after rcu_barrier has run, risking a crash.
Risk Assessment
This could lead to system crashes or memory corruption, threatening system security.
Recommendation
Apply the Linux kernel patch that releases the key slot and any remaining skb before dropping the peer reference.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ovpn: finish crypto callback cleanup before peer release Crypto completion callbacks hold both key-slot and peer references. The peer reference pins the netdev, and dropping the last peer reference can let netdev unregistration and module removal make progress. Do not release that peer reference before the callback has finished its own cleanup. If ovpn_crypto_key_slot_put runs after ovpn_peer_put, it can schedule an RCU callback backed by module text after ovpn_cleanup rcu_barrier has already run. The TX error path also freed the remaining skb after ovpn_peer_put, leaving callback cleanup outside the peer/netdev lifetime window. Release the key slot and free any remaining skb first, then drop the peer reference as the last callback action.