CVE-2026-97472 is a vulnerability in Linux Kernel
Published on September 24, 2026
ipv6: addrconf: fix temp address generation after prefix deprecation
In the Linux kernel, the following vulnerability has been resolved:
ipv6: addrconf: fix temp address generation after prefix deprecation
When a router temporarily deprecates an IPv6 prefix (either by sending a
Router Advertisement with Preferred Lifetime = 0 or by letting the
lifetime expire) and later restores it, the kernel permanently loses its
ability to generate temporary privacy addresses (RFC 8981) for that
prefix.
This happens because the address worker attempts to generate a
replacement temporary address when the current one nears expiration. As
the base prefix is deprecated already, the generation fails after
marking the temporary address as already having spawned a replacement
(ifp->regen_count++).
When the router eventually restores the prefix, the temporary address
becomes active again. However, once it naturally expires, the address
worker sees this temporary address already tried to generate one and
skips the regeneration.
Fix the issue by resetting the regen_count check of the latest temp
address generated for the prefix updated by the incoming RA.
Products Associated with CVE-2026-97472
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below bff7b87dfa28a1502c18d0c6f1fadda5162fa854 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 4df5597c65446135362f72880995e8920f058fa0 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below e20d8922aa8fe441d291364c96c2179a005b79ea is affected.
- Before 6.12.111 is affected.
- Before 6.18.53 is affected.
- Version 6.12.111, <= 6.12.* is unaffected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2, <= * is unaffected.