Race condition in Linux kernel - CVE-2026-45918
Published: May 28, 2026
Vulnerability identifier: #VU132575
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45918
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in ovpn_tcp_socket_detach() when deleting a peer after keepalive expiration while the associated TCP socket is being closed concurrently. A local user can trigger concurrent peer release and socket close operations to cause a denial of service.
The issue occurs because sk->sk_socket may become NULL during tcp_close() before the detach routine restores the original socket operations.
How to mitigate CVE-2026-45918
Install security update from vendor's repository.