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CVE-2026-31418

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: drop logically empty buckets in mtype_del mtype_del() counts empty slots below n->pos in k, but it only drops…

Published Apr 13, 2026EPSS 0.12%

Overview

CVE-2026-31418 is a medium-severity vulnerability. It was published on April 13, 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:

netfilter: ipset: drop logically empty buckets in mtype_del

mtype_del() counts empty slots below n->pos in k, but it only drops the

bucket when both n->pos and k are zero. This misses buckets whose live

entries have all been removed while n->pos still points past deleted slots.

Treat a bucket as empty when all positions below n->pos are unused and

release it directly instead of shrinking it further.

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/58f3a14826d4e6b0d5421f1a64be280b48601ea2Refgit.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4Refgit.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233Refgit.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02Refgit.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fbRefgit.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323Refgit.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afafRefgit.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4Refcert-portal.siemens.com/productcert/html/ssa-019113.htmlRefcert-portal.siemens.com/productcert/html/ssa-082556.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31418?

CVE-2026-31418 is a medium-severity vulnerability. It was published on April 13, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31418?

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-2026-31418?

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-2026-31418?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31418 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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