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CVE-2024-40921

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net: bridge: mst: pass vlan group directly to br_mst_vlan_set_state Pass the already obtained vlan group pointer to br_mst_vlan…

Published Jul 12, 2024EPSS 0.29%

Overview

CVE-2024-40921 is a medium-severity vulnerability. It was published on July 12, 2024 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:

net: bridge: mst: pass vlan group directly to br_mst_vlan_set_state

Pass the already obtained vlan group pointer to br_mst_vlan_set_state()

instead of dereferencing it again. Each caller has already correctly

dereferenced it for their context. This change is required for the

following suspicious RCU dereference fix. No functional changes

intended.

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/09f4337c27f5bdeb8646a6db91488cc2f7d537ffRefgit.kernel.org/stable/c/36c92936e868601fa1f43da6758cf55805043509Refgit.kernel.org/stable/c/a6cc9e9a651b9861efa068c164ee62dfba68c6caRefgit.kernel.org/stable/c/d2dc02775fc0c4eacaee833a0637e5958884a8e5Refgit.kernel.org/stable/c/09f4337c27f5bdeb8646a6db91488cc2f7d537ffRefgit.kernel.org/stable/c/36c92936e868601fa1f43da6758cf55805043509Refgit.kernel.org/stable/c/a6cc9e9a651b9861efa068c164ee62dfba68c6caRefgit.kernel.org/stable/c/d2dc02775fc0c4eacaee833a0637e5958884a8e5Reflists.debian.org/debian-lts-announce/2025/01/msg00001.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-40921?

CVE-2024-40921 is a medium-severity vulnerability. It was published on July 12, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-40921?

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-2024-40921?

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-2024-40921?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-40921 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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