CVE-2026-68341 ovpn: fix use after free in unlock_ovpn()
A use-after-free vulnerability in the Linux kernel's ovpn module allows attackers to potentially execute code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68341?
CVE-2026-68341 is a high-severity use after free vulnerability in Linux, published on 10 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-68341?
How do I fix CVE-2026-68341?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-68341 being exploited?
There is no known exploitation of CVE-2026-68341 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68341, DEBIAN-CVE-2026-68341, GHSA-998j-mxm9-vqxj, UBUNTU-CVE-2026-68341.