Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 282f23c6ee343126156dd41218b22ece96d747e3 before 8b0a3a094f4cae2fb92e4d08d4eef7246a9d9c49; affected 282f23c6ee343126156dd41218b22ece96d747e3 before 0fe4636665d14a258de70b4f3e8248e6d42038f1; affected 282f23c6ee343126156dd41218b22ece96d747e3 before 234f9ffbd9b2c1b24ec67200ea3cff07401bec48; affected 282f23c6ee343126156dd41218b22ece96d747e3 before 22cec809b048495310f206d9abbcdbbfbdce3ae3; affected 282f23c6ee343126156dd41218b22ece96d747e3 before a28c4fcbf774e23b4779cae468e3497a5ad1f4a1; affected 86791bbfe5ed7b275be040cfeff049a1624af1b7; affected 61f69dc4e40e41b0018f00fa4aeb23d3239556fb; affected 34fb350281ced2a72707a5c0064f69992d440edb; affected 3.0.58 before 3.1; affected 3.2.37 before 3.3; affected 3.4.25 before 3.5 |
| Linux / Linux | affected 3.6; unaffected 0 before 3.6; unaffected 6.6.153 through 6.6.*; unaffected 6.12.105 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/8b0a3a094f4cae2fb92e4d08d4eef7246a9d9c49
- https://git.kernel.org/stable/c/0fe4636665d14a258de70b4f3e8248e6d42038f1
- https://git.kernel.org/stable/c/234f9ffbd9b2c1b24ec67200ea3cff07401bec48
- https://git.kernel.org/stable/c/22cec809b048495310f206d9abbcdbbfbdce3ae3
- https://git.kernel.org/stable/c/a28c4fcbf774e23b4779cae468e3497a5ad1f4a1
ADP enrichment
No English description supplied.
No references supplied.