ovpn: tcp - don't deref NULL sk_socket member after tcp_close()

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Summary

CVECVE-2026-45918
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:06 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ovpn: tcp - don't deref NULL sk_socket member after tcp_close() When deleting a peer in case of keepalive expiration, the peer is removed from the OpenVPN hashtable and is temporary inserted in a "release list" for further processing. This happens in: ovpn_peer_keepalive_work() unlock_ovpn(release_list) This processing includes detaching from the socket being used to talk to this peer, by restoring its original proto and socket ops/callbacks. In case of TCP it may happen that, while the peer is sitting in the release list, userspace decides to close the socket. This will result in a concurrent execution of: tcp_close(sk) __tcp_close(sk) sock_orphan(sk) sk_set_socket(sk, NULL) The last function call will set sk->sk_socket to NULL. When the releasing routine is resumed, ovpn_tcp_socket_detach() will attempt to dereference sk->sk_socket to restore its original ops member. This operation will crash due to sk->sk_socket being NULL. Fix this race condition by testing-and-accessing sk->sk_socket atomically under sk->sk_callback_lock.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.043990000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 11851cbd60ea1e5abbd97619d69845ead99303d6 f998b2c4bec487063a586695159f9a1856e81c56 git Not specified
CNA Linux Linux affected 11851cbd60ea1e5abbd97619d69845ead99303d6 b9142cf4e066c825ec68752a7dcaceda700bbe26 git Not specified
CNA Linux Linux affected 11851cbd60ea1e5abbd97619d69845ead99303d6 94560267d6c41b1ff3fafbab726e3f8a55a6af34 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/94560267d6c41b1ff3fafbab726e3f8a55a6af34 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f998b2c4bec487063a586695159f9a1856e81c56 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b9142cf4e066c825ec68752a7dcaceda700bbe26 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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