CVE-2026-64043
Low risk· EPSS 10%Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
A race condition in the Linux kernel's ovpn driver can occur when deleting a network interface. In a narrow time window, adding a new peer via netlink may cause the netdevice to hang and prevent its unregistration.
Risk Assessment
An attacker could exploit this race condition to cause a denial of service (DoS) by deliberately triggering the race, leading to a hung network interface that cannot be removed.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit that removes ovpn_dellink() and adds reg_state check in ovpn_peer_add()).
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Original NVD description (English source)
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 ovpn_dellink(), when all existing peers are freed and the device is queued for deregistration, but a CMD_PEER_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 ovpn_peer_add() has now an extra check that forces the function to bail out if the device reg_state is not REGISTERED. This way any incoming CMD_PEER_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.