AZL-95003
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-95003.json
- JSON Data
- https://api.osv.dev/v1/vulns/AZL-95003
- Upstream
- Published
- 2026-08-10T13:19:56Z
- Modified
- 2026-08-31T05:26:27Z
- Summary
- CVE-2026-68118 affecting package kernel 6.6.150.1-1
- Details
-
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 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 tcpsendchallengeack() so request sockets can share it. Use the request socket's sendack() callback and its own out-of-window ACK timestamp to send and rate-limit the response.
- References