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CVE-2026-43339

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ipv6: prevent possible UaF in addrconf_permanent_addr() The mentioned helper try to warn the user about an exceptional conditio…

Published May 8, 2026CWE-416EPSS 0.12%

Overview

CVE-2026-43339 is a high-severity vulnerability. It was published on May 8, 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:

ipv6: prevent possible UaF in addrconf_permanent_addr()

The mentioned helper try to warn the user about an exceptional

condition, but the message is delivered too late, accessing the ipv6

after its possible deletion.

Reorder the statement to avoid the possible UaF; while at it, place the

warning outside the idev->lock as it needs no protection.

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/25357b670afb5b517096da783abaa5cc4bf8359eRefgit.kernel.org/stable/c/2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1Refgit.kernel.org/stable/c/3cd4efb5df72843dfac892d0b3c7a4a8bd926b65Refgit.kernel.org/stable/c/7bfafa1b0cd582983ebec6bb20f0a435528fe567Refgit.kernel.org/stable/c/7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1eRefgit.kernel.org/stable/c/bacc7f31085c9820922f00bc7d79756ffa13123aRefgit.kernel.org/stable/c/eec49a33611f20336b357b3953df44f1a02049e8Refgit.kernel.org/stable/c/fd63f185979b047fb22a0dfc6bd94d0cab6a6a70

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43339?

CVE-2026-43339 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43339?

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-2026-43339?

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-2026-43339?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43339 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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