CVE-2026-68341
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk44th percentile - higher than 44% of all known CVEs
Summary
In the Linux kernel's ovpn, unlock_ovpn() uses llist_for_each_entry() to iterate over the release_list, but after freeing a peer inside the loop, it reads peer->release_entry.next after the peer may have been freed, leading to use-after-free.
Risk Assessment
The vulnerability could cause system crashes or potential privilege escalation in the kernel.
Recommendation
Apply the Linux kernel patch that uses llist_for_each_entry_safe() for safe iteration.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ovpn: fix use after free in unlock_ovpn() unlock_ovpn() iterates over the release_list using llist_for_each_entry() and drops the peer reference inside the loop body via ovpn_peer_put(). If this drops the last reference, the peer is eventually freed. However, llist_for_each_entry() reads peer->release_entry.next in the loop advance expression, which runs after the body. By that time the peer may have already been freed, resulting in a use after free when advancing to the next list entry. Fix this by using llist_for_each_entry_safe(), which caches the next pointer before executing the loop body.