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Vulnerability record · CVE-2026-31638 · published 24 April 2026

CVE-2026-31638: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 0.63% · top 51.9% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score
0.63%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-31638), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.