ipv6: prevent possible UaF in addrconf_permanent_addr()

Summary

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.

Timeline

1. May 8, 2026, 1:31 PM UTCCVE published
2. Oct 16, 2026, 3:16 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 19, 2026, 7:16 PM UTCRecord last updated

Affected versions

• Linux Linux

  From f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac · fixed in eec49a33611f20336b357b3953df44f1a02049e8; From f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac · fixed in bacc7f31085c9820922f00bc7d79756ffa13123a; From f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac · fixed in 7bfafa1b0cd582983ebec6bb20f0a435528fe567; From f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac · fixed in 7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1e; From f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac · fixed in 25357b670afb5b517096da783abaa5cc4bf8359e; From f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac · fixed in 3cd4efb5df72843dfac892d0b3c7a4a8bd926b65; From f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac · fixed in 2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1; From f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac · fixed in fd63f185979b047fb22a0dfc6bd94d0cab6a6a70

• Linux Linux

  4.6

• KernelLinux

  From 4.6.0 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.168; From 6.2.0 · fixed in 6.6.134; From 6.7.0 · fixed in 6.12.81; From 6.13.0 · fixed in 6.18.22; From 6.19.0 · fixed in 6.19.12

References 8