ovpn: fix race between deleting interface and adding new peer

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Summary

CVECVE-2026-64043
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:44 UTC
Updated2026-07-19 16:17:44 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.097900000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 80747caef33d77f5c1b3d24644e6d7dae69066b5 097d62df38314c14b88fab9096f3461baf158e2b git Not specified
CNA Linux Linux affected 80747caef33d77f5c1b3d24644e6d7dae69066b5 de9fec2a6645f5b4d23398cd870a33e2703728d9 git Not specified
CNA Linux Linux affected 80747caef33d77f5c1b3d24644e6d7dae69066b5 982422b11e6f95f766a8cd2c2b1cbdb77e234a61 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/de9fec2a6645f5b4d23398cd870a33e2703728d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/982422b11e6f95f766a8cd2c2b1cbdb77e234a61 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/097d62df38314c14b88fab9096f3461baf158e2b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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