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CVE-2026-43042

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mpls: add seqcount to protect the platform_label{,s} pair The RCU-protected codepaths (mpls_forward, mpls_dump_routes) can have…

Published May 1, 2026CWE-125EPSS 0.16%

Overview

CVE-2026-43042 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. 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:

mpls: add seqcount to protect the platform_label{,s} pair

The RCU-protected codepaths (mpls_forward, mpls_dump_routes) can have

an inconsistent view of platform_labels vs platform_label in case of a

concurrent resize (resize_platform_label_table, under

platform_mutex). This can lead to OOB accesses.

This patch adds a seqcount, so that we get a consistent snapshot.

Note that mpls_label_ok is also susceptible to this, so the check

against RTA_DST in rtm_to_route_config, done outside platform_mutex,

is not sufficient. This value gets passed to mpls_label_ok once more

in both mpls_route_add and mpls_route_del, so there is no issue, but

that additional check must not be removed.

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/5bb3caf0bbfb56f1a00d2af072ac3d8395a3b9efRefgit.kernel.org/stable/c/629ec78ef8608d955ce217880cdc3e1873af3a15

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43042?

CVE-2026-43042 is a high-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-43042?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43042?

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-2026-43042?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43042 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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