CVE-2026-68118 tcp: challenge ACK for non-exact RST in SYN-RECEIVED

In the Linux kernel, the following vulnerability has been resolved: tcp: challenge ACK for non-exact RST in SYN-RECEIVED The SYN-RECEIVED request-socket path in tcpcheckreq accepts an in-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A non-exact RST therefore removes the request...

CVE-2026-68118

The CVE-2026-68118 issue affects the Linux kernel TCP stack: the SYN-RECEIVED path tcp_check_req() accepted in-window non-exact RSTs without exact SEG.SEQ match, causing the request to be removed instead of issuing a challenge ACK. The fix enforces RFC 9293/5961 order by applying the RST check be...