CVE-2026-31638
Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Only put the call ref if one was acquired rxrpc_input_packet_on_conn() can process a to-client packet after the current client call on the channel has already been torn down. In that case chan->call is NULL, rxrpc_try_get_call() returns NULL and there is no reference to drop. The client-side implicit-end error path does not account for that and unconditionally calls rxrpc_put_call(). This turns a protocol error path into a kernel crash instead of rejecting the packet. Only drop the call reference if one was actually acquired. Keep the existing protocol error handling unchanged.
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 | 6.12.85-1 |
| linux-kernel | affected | 6.6.135 | |
| linux-kernel | 6.2 | affected | |
| linux-kernel | 7.0 | affected | |
References
- https://git.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452d
- https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5
- https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4
- https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38
- https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd
- https://www.suse.com/security/cve/CVE-2026-31638.html
- https://security-tracker.debian.org/tracker/CVE-2026-31638
CWEs
CWE-476
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.