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CVE-2026-31639

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix key reference count leak from call->key When creating a client call in rxrpc_alloc_client_call(), the code obtains a…

Published Apr 24, 2026EPSS 0.16%

Overview

CVE-2026-31639 is a medium-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: Fix key reference count leak from call->key

When creating a client call in rxrpc_alloc_client_call(), the code obtains

a reference to the key. This is never cleaned up and gets leaked when the

call is destroyed.

Fix this by freeing call->key in rxrpc_destroy_call().

Before the patch, it shows the key reference counter elevated:

$ cat /proc/keys | grep afs@54321

1bffe9cd I--Q--i 8053480 4169w 3b010000 1000 1000 rxrpc afs@54321: ka

$

After the patch, the invalidated key is removed when the code exits:

$ cat /proc/keys | grep afs@54321

$

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/2e6ef713b1598f6acd7f302fa6b12b6731c89914Refgit.kernel.org/stable/c/978108902ee4ef2b348ff7ec36ad014dc5bc6dc6Refgit.kernel.org/stable/c/d666540d217e8d420544ebdfbadeedd623562733Refgit.kernel.org/stable/c/e6b7943c5dc875647499da09bf4d50a8557ab0c3Refgit.kernel.org/stable/c/f1a7a3ab0f35f83cf11bba906b9e948cf3788c28

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31639?

CVE-2026-31639 is a medium-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31639?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31639?

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-2026-31639?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31639 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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