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CVE-2026-43219

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: net: cpsw_new: Fix potential unregister of netdev that has not been registered yet If an error occurs during register_netdev()…

Published May 6, 2026EPSS 0.13%

Overview

CVE-2026-43219 is a medium-severity vulnerability. It was published on May 6, 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:

net: cpsw_new: Fix potential unregister of netdev that has not been registered yet

If an error occurs during register_netdev() for the first MAC in

cpsw_register_ports(), even though cpsw->slaves[0].ndev is set to NULL,

cpsw->slaves[1].ndev would remain unchanged. This could later cause

cpsw_unregister_ports() to attempt unregistering the second MAC.

To address this, add a check for ndev->reg_state before calling

unregister_netdev(). With this change, setting cpsw->slaves[i].ndev

to NULL becomes unnecessary and can be removed accordingly.

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/14645799ad5253a028cf662e2f9cd18a68f74b31Refgit.kernel.org/stable/c/23acc565186ee27e788408cbd81b92730b6aaa3aRefgit.kernel.org/stable/c/29739ec197ed66535bc0b86f14ab66c5f4512138Refgit.kernel.org/stable/c/349c4cac6f54a81fc107589771f88136a2b20415Refgit.kernel.org/stable/c/67cca9df4d17f2c824655d31195b2e75334ae286Refgit.kernel.org/stable/c/9d724b34fbe13b71865ad0906a4be97571f19cf5Refgit.kernel.org/stable/c/d31a12cee10bbc12b4b523a4709fd1fdee8b7d0fRefgit.kernel.org/stable/c/da8e1623a3028e1d8c75eec7898d94c6f17dce40

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43219?

CVE-2026-43219 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43219?

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-2026-43219?

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-2026-43219?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43219 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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