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CVE-2026-31638

7.5 · HIGH

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…

Published Apr 24, 2026CWE-476EPSS 0.63%

Overview

CVE-2026-31638 is a high-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452dRefgit.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5Refgit.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4Refgit.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38Refgit.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31638?

CVE-2026-31638 is a high-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-31638?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31638?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31638?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31638 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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