CVE-2026-43339
Received Received - Intake
Use-After-Free in Linux Kernel IPv6 Networking

Publication date: 2026-05-08

Last updated on: 2026-05-11

Assigner: kernel.org

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.
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Meta Information
Published
2026-05-08
Last Modified
2026-05-11
Generated
2026-06-19
AI Q&A
2026-05-08
EPSS Evaluated
2026-06-18
NVD
CVE-2026-43339
EUVD
EUVD-2026-28623
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's IPv6 implementation, specifically in the function addrconf_permanent_addr(). It involves a possible Use-after-Free (UaF) condition where the code attempts to warn the user about an exceptional condition, but the warning message is delivered too late, causing access to IPv6 data after it may have been deleted.

The fix involved reordering the statements to avoid the Use-after-Free scenario and moving the warning message outside of a lock that was not necessary for protection.

Impact Analysis

A Use-after-Free vulnerability can lead to undefined behavior such as system crashes, data corruption, or potentially allow an attacker to execute arbitrary code with kernel privileges. In this case, since it affects the Linux kernel's IPv6 address configuration, it could impact system stability or security when handling IPv6 addresses.

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