CVE-2026-64043

In the Linux kernel, the following vulnerability has been resolved:

ovpn: fix race between deleting interface and adding new peer

While deleting an existing ovpn interface, there is a very narrow window where adding a new peer via netlink may cause the netdevice to hang and prevent its unregistration.

It may happen during ovpndellink(), when all existing peers are freed and the device is queued for deregistration, but a CMDPEER_NEW message comes in adding a new peer that takes again a reference to the netdev.

At this point there is no way to release the device because we are under the assumption that all peers were already released.

Fix the race condition by releasing all peers in ndo_uninit(), when the netdevice has already been removed from the netdev list.

Also ovpnpeeradd() has now an extra check that forces the function to bail out if the device regstate is not REGISTERED. This way any incoming CMDPEER_NEW racing with the interface deletion routine will simply stop before adding the peer.

Note that the above check happens while holding the netdev_lock to prevent racing netdev state changes.

ovpn_dellink() is now empty and can be removed.