CVE-2026-68118 (GCVE-0-2026-68118)
Vulnerability from cvelistv5
Published
2026-08-10 11:58
Modified
2026-10-19 20:58
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Summary
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 tcp_check_req() accepts an in-window RST without requiring SEG.SEQ to exactly match RCV.NXT. A non-exact RST therefore removes the request instead of eliciting a challenge ACK. RFC 9293 section 3.10.7.4 applies the RFC 5961 reset check in SYN-RECEIVED: an exact RST resets the connection, while a non-exact in-window RST must trigger a challenge ACK and be dropped. Apply that check before the ACK-field validation, following the RFC sequence-number, RST, then ACK processing order. Factor the per-netns challenge ACK quota out of tcp_send_challenge_ack() so request sockets can share it. Use the request socket's send_ack() callback and its own out-of-window ACK timestamp to send and rate-limit the response.
References
Impacted products
Vendor Product Version
Linux Linux Version: 282f23c6ee343126156dd41218b22ece96d747e3
Version: 282f23c6ee343126156dd41218b22ece96d747e3
Version: 282f23c6ee343126156dd41218b22ece96d747e3
Version: 282f23c6ee343126156dd41218b22ece96d747e3
Version: 282f23c6ee343126156dd41218b22ece96d747e3
Version: 86791bbfe5ed7b275be040cfeff049a1624af1b7
Version: 61f69dc4e40e41b0018f00fa4aeb23d3239556fb
Version: 34fb350281ced2a72707a5c0064f69992d440edb
Version: 3.0.58   ≤
Version: 3.2.37   ≤
Version: 3.4.25   ≤
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