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Vulnerability record · CVE-2026-43339 · published 8 May 2026

CVE-2026-43339: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.6% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/25357b670afb5b517096da783abaa5cc4bf8359e Patch
https://git.kernel.org/stable/c/2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1 Patch
https://git.kernel.org/stable/c/3cd4efb5df72843dfac892d0b3c7a4a8bd926b65 Patch
https://git.kernel.org/stable/c/7bfafa1b0cd582983ebec6bb20f0a435528fe567 Patch
https://git.kernel.org/stable/c/7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1e Patch
https://git.kernel.org/stable/c/bacc7f31085c9820922f00bc7d79756ffa13123a Patch
https://git.kernel.org/stable/c/eec49a33611f20336b357b3953df44f1a02049e8 Patch
https://git.kernel.org/stable/c/fd63f185979b047fb22a0dfc6bd94d0cab6a6a70 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43339), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.