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CVE-2026-31738

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: vxlan: validate ND option lengths in vxlan_na_create vxlan_na_create() walks ND options according to option-provided lengths.

Published May 1, 2026EPSS 0.16%

Overview

CVE-2026-31738 is a medium-severity vulnerability. It was published on May 1, 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:

vxlan: validate ND option lengths in vxlan_na_create

vxlan_na_create() walks ND options according to option-provided

lengths. A malformed option can make the parser advance beyond the

computed option span or use a too-short source LLADDR option payload.

Validate option lengths against the remaining NS option area before

advancing, and only read source LLADDR when the option is large enough

for an Ethernet address.

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/2029712fb2c87e9a8c75094906f2ee29bf08c500Refgit.kernel.org/stable/c/602596c69a70e50d9ab8c6ae0290a01f88229dd7Refgit.kernel.org/stable/c/901c1dd3bab2955d7e664f914c374c8c3ac2b958Refgit.kernel.org/stable/c/afa9a05e6c4971bd5586f1b304e14d61fb3d9385Refgit.kernel.org/stable/c/b69c4236255bd8de16cd876e58c6f0867d1d78b1Refgit.kernel.org/stable/c/de20d2e3b9179d132f5f5b44e490d7c916c6321bRefgit.kernel.org/stable/c/e476745917a1e288eb15e7ff49d286a86a4861d3Refgit.kernel.org/stable/c/eddfce70a6f3107d1679b0c2fcbeb96b593bd679

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31738?

CVE-2026-31738 is a medium-severity vulnerability. It was published on May 1, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31738?

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-2026-31738?

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-2026-31738?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31738 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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