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CVE-2026-43040

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak When processing Rout…

Published May 1, 2026CWE-909EPSS 0.17%

Overview

CVE-2026-43040 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:

net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak

When processing Router Advertisements with user options the kernel

builds an RTM_NEWNDUSEROPT netlink message. The nduseroptmsg struct

has three padding fields that are never zeroed and can leak kernel data

The fix is simple, just zeroes the padding fields.

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/11d7fe97421cfc81549940c20ed5ac9472d6db05Refgit.kernel.org/stable/c/1da9023f6b071a38e5430ffbce4b70b2b1ac4f9cRefgit.kernel.org/stable/c/2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648Refgit.kernel.org/stable/c/4f810c686fde509d1cdaa706322d9d2531f8f1a4Refgit.kernel.org/stable/c/7f56d87e527bb5a13c3e8b0d5840cb6332822f6dRefgit.kernel.org/stable/c/ae05340ccaa9d347fe85415609e075545bec589fRefgit.kernel.org/stable/c/b485eef3d97b7aae55ce669b6de555ec81f3d21cRefgit.kernel.org/stable/c/ef3645606e4a635d5062a492f22b7f490852ee67Refcert-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-2026-43040?

CVE-2026-43040 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-2026-43040?

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-2026-43040?

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-2026-43040?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43040 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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