CVE-2026-31640
Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix use of wrong skb when comparing queued RESP challenge serial In rxrpc_post_response(), the code should be comparing the challenge serial number from the cached response before deciding to switch to a newer response, but looks at the newer packet private data instead, rendering the comparison always false. Fix this by switching to look at the older packet. Fix further[1] to substitute the new packet in place of the old one if newer and also to release whichever we don't use.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 6.19.13-1 |
| debian | sid | fixed | 6.19.13-1 |
| debian | trixie | fixed | 0 |
| linux-kernel | affected | 6.18.23 | |
| linux-kernel | 6.16 | affected | |
| linux-kernel | 7.0 | affected | |
References
- https://git.kernel.org/stable/c/20386e7f8d97475b8d815873e246423317ec4260
- https://git.kernel.org/stable/c/9132b1a7bf83b4a8042fffbc99d075b727a16742
- https://git.kernel.org/stable/c/b33f5741bb187db8ff32e8f5b96def77cc94dfca
- https://www.suse.com/security/cve/CVE-2026-31640.html
- https://security-tracker.debian.org/tracker/CVE-2026-31640
CWEs
CWE-401
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.