What’s Vulnerable › Vulnerabilities

CVE-2026-43339: ipv6: prevent possible UaF in addrconf_permanent_addr()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-10-19
• Weakness: CWE-416

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.

Affected products

• Linux kernel: from 4.6 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22 — fixed in 5.10.253, 5.15.203, 6.1.168, 6.12.81, 6.18.22, 6.19.12

How to fix

Upgrade to a fixed version: Linux kernel 5.10.253, 5.15.203, 6.1.168, 6.12.81. Check the vendor advisory for mitigations.

References

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

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