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CVE-2026-23437

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net: shaper: protect late read accesses to the hierarchy We look up a netdev during prep of Netlink ops (pre- callbacks) and ta…

Published Apr 3, 2026EPSS 0.13%

Overview

CVE-2026-23437 is a high-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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: shaper: protect late read accesses to the hierarchy

We look up a netdev during prep of Netlink ops (pre- callbacks)

and take a ref to it. Then later in the body of the callback

we take its lock or RCU which are the actual protections.

This is not proper, a conversion from a ref to a locked netdev

must include a liveness check (a check if the netdev hasn't been

unregistered already). Fix the read cases (those under RCU).

Writes needs a separate change to protect from creating the

hierarchy after flush has already run.

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/0f9ea7141f365b4f27226898e62220fb98ef8dc6Refgit.kernel.org/stable/c/348758ba74e6a348299965b16a97cfb817545cc0Refgit.kernel.org/stable/c/581eee0890a8bde44f1fb78ad3e70502a897d583

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23437?

CVE-2026-23437 is a high-severity vulnerability. It was published on April 3, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23437?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2026-23437?

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-2026-23437?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23437 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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