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CVE-2026-31621

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: bnge: return after auxiliary_device_uninit() in error path When auxiliary_device_add() fails, the error block calls auxiliary_d…

Published Apr 24, 2026CWE-908EPSS 0.16%

Overview

CVE-2026-31621 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:

bnge: return after auxiliary_device_uninit() in error path

When auxiliary_device_add() fails, the error block calls

auxiliary_device_uninit() but does not return. The uninit drops the

last reference and synchronously runs bnge_aux_dev_release(), which sets

bd->auxr_dev = NULL and frees the underlying object. The subsequent

bd->auxr_dev->net = bd->netdev then dereferences NULL, which is not a

good thing to have happen when trying to clean up from an error.

Add the missing return, as the auxiliary bus documentation states is a

requirement (seems that LLM tools read documentation better than humans

do...)

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/38c383ec6d37f4b5597f8e6a1f5c2ab31ea01d3aRefgit.kernel.org/stable/c/87bc3557c708110d83086bf091328271298a44e3Refgit.kernel.org/stable/c/8b0c25528cb64f71a73b5c0d49cbbcb68540a4ce

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31621?

CVE-2026-31621 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-2026-31621?

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-2026-31621?

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-2026-31621?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31621 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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