High 7.5Published Apr 24, 2026

CVE-2026-31638rxrpc: Only put the call ref if one was acquired

Updated under an hour ago (Oct 28, 2026, 12:30 AM ET)

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 5e6ef4f1017c7f844e305283bbd8875af475e2fc before b8f66447448d6c305a51413a67ec8ed26aa7d1dd; 5e6ef4f1017c7f844e305283bbd8875af475e2fc builds before 0c156aff8a2d4fa0d61db7837641975cf0e5452d; from 5e6ef4f1017c7f844e305283bbd8875af475e2fc before 8299ca146489664e3c0c90a3b8900d8335b1ede4; from 5e6ef4f1017c7f844e305283bbd8875af475e2fc before 9fb09861e2b8d1abfe2efaf260c9f1d30080ea38; from 5e6ef4f1017c7f844e305283bbd8875af475e2fc before 6331f1b24a3e85465f6454e003a3e6c22005a5c5	CNA record
linux linux_kernel linux:linux_kernel	from 6.2.1 before 6.6.135; from 6.7 before 6.12.82; from 6.13 before 6.18.23; from 6.19 before 6.19.13; 6.2; 7.0; 7.0; 7.0; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd	patch
https://git.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452d	patch
https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4	patch
https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38	patch
https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.