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CVE-2026-31692

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: add missing netlink_ns_capable() check for peer netns rtnl_newlink() lacks a CAP_NET_ADMIN capability check on the p…

Published Apr 30, 2026EPSS 0.12%

Overview

CVE-2026-31692 is a medium-severity vulnerability. It was published on April 30, 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:

rtnetlink: add missing netlink_ns_capable() check for peer netns

rtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer

network namespace when creating paired devices (veth, vxcan,

netkit). This allows an unprivileged user with a user namespace

to create interfaces in arbitrary network namespaces, including

init_net.

Add a netlink_ns_capable() check for CAP_NET_ADMIN in the peer

namespace before allowing device creation to proceed.

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/0975b64ffb34560042090a5986c3a02e6c80f36fRefgit.kernel.org/stable/c/7b735ef81286007794a227ce2539419479c02a5fRefgit.kernel.org/stable/c/d04cc16d3624218a5458b2b664ae431f1b3b334d

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31692?

CVE-2026-31692 is a medium-severity vulnerability. It was published on April 30, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-31692?

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-2026-31692?

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-2026-31692?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31692 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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