CVE-2026-68118
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
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 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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 282f23c6ee343126156dd41218b22ece96d747e3 | affected | git | 8b0a3a094f4cae2fb92e4d08d4eef7246a9d9c49 | Unavailable | None listed |
| 282f23c6ee343126156dd41218b22ece96d747e3 | affected | git | 0fe4636665d14a258de70b4f3e8248e6d42038f1 | Unavailable | None listed |
| 282f23c6ee343126156dd41218b22ece96d747e3 | affected | git | 234f9ffbd9b2c1b24ec67200ea3cff07401bec48 | Unavailable | None listed |
| 282f23c6ee343126156dd41218b22ece96d747e3 | affected | git | 22cec809b048495310f206d9abbcdbbfbdce3ae3 | Unavailable | None listed |
| 282f23c6ee343126156dd41218b22ece96d747e3 | affected | git | a28c4fcbf774e23b4779cae468e3497a5ad1f4a1 | Unavailable | None listed |
| 86791bbfe5ed7b275be040cfeff049a1624af1b7 | affected | git | Unavailable | Unavailable | None listed |
| 61f69dc4e40e41b0018f00fa4aeb23d3239556fb | affected | git | Unavailable | Unavailable | None listed |
| 34fb350281ced2a72707a5c0064f69992d440edb | affected | git | Unavailable | Unavailable | None listed |
| 3.0.58 | affected | semver | 3.1 | Unavailable | None listed |
| 3.2.37 | affected | semver | 3.3 | Unavailable | None listed |
| 3.4.25 | affected | semver | 3.5 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3.6 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.6 | Unavailable | None listed |
| 6.6.153 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.105 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.42 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.6 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |