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CVE-2026-31679

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: openvswitch: validate MPLS set/set_masked payload length validate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload fo…

Published Apr 25, 2026EPSS 0.17%

Overview

CVE-2026-31679 is a high-severity vulnerability. It was published on April 25, 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:

openvswitch: validate MPLS set/set_masked payload length

validate_set() accepted OVS_KEY_ATTR_MPLS as variable-sized payload for

SET/SET_MASKED actions. In action handling, OVS expects fixed-size

MPLS key data (struct ovs_key_mpls).

Use the already normalized key_len (masked case included) and reject

non-matching MPLS action key sizes.

Reject invalid MPLS action payload lengths early.

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/2ca33b88a79ca42f017ae0f7011280325655438eRefgit.kernel.org/stable/c/4cae986225f8b8679ad86b924918e7d75a96aa61Refgit.kernel.org/stable/c/546b68ac893595877ffbd7751e5c55fd1c43ede6Refgit.kernel.org/stable/c/68f32ef0683c8d1c05cd2e4f16818fa63ff59c6fRefgit.kernel.org/stable/c/8ed7b9930cbc3bc71f868fa79a68700ac88d586aRefgit.kernel.org/stable/c/98de18d327ef8cbbb704980e359e4872d8c28997Refgit.kernel.org/stable/c/bd50c7484c3bb34097571c1334174fb8b7408036Refgit.kernel.org/stable/c/c1f97152df8dfb17e855ddf0fc409b7bd13e9700

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31679?

CVE-2026-31679 is a high-severity vulnerability. It was published on April 25, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-31679?

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-2026-31679?

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-2026-31679?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31679 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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