CVE-2026-97472
UnknownSummary
In the Linux kernel, after a router temporarily deprecates an IPv6 prefix and later restores it, the kernel permanently loses the ability to generate temporary privacy addresses (RFC 8981) for that prefix. The fix resets the regen_count check for the latest temporary address when processing an incoming Router Advertisement.
Risk Assessment
Loss of temporary IPv6 address generation weakens user privacy and may cause connectivity issues after routing changes. This affects hosts with IPv6 temporary addresses enabled.
Recommendation
Update the Linux kernel to a version containing the fix. Until then, consider manually refreshing IPv6 address configuration on affected hosts.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS