CVE-2026-97472

Description

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.

Gravité et risque d'exploitation

CVE-2026-97472 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 6.2 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <3.2, <=6.12.*, <4f7d2a8dc364c4e55d0a1533451339008512933f, 6.18.53, 0, <6da8ba900b85e6478e211427630c67595fb707a4, <4df5597c65446135362f72880995e8920f058fa0, 5.10.271, 6.6.158, <=5.10.*, <=6.6.*, <f601ec5c92b3260c742f27a5d2fd289e30ae798f, 6.1.189, <e20d8922aa8fe441d291364c96c2179a005b79ea, <=6.18.*, 5.15.222, 3.2, <bff7b87dfa28a1502c18d0c6f1fadda5162fa854, 76f793e3a47139d340185cbc1a314740c09b13d3, <b00f7c1da82a809156f785ed37536c2d2584927d, <=*, <=5.15.*, 7.2, 6.12.111) est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://git.kernel.org/stable/c/b00f7c1da82a809156f785ed37536c2d2584927d
• https://git.kernel.org/stable/c/6da8ba900b85e6478e211427630c67595fb707a4
• https://git.kernel.org/stable/c/4f7d2a8dc364c4e55d0a1533451339008512933f
• https://git.kernel.org/stable/c/f601ec5c92b3260c742f27a5d2fd289e30ae798f
• https://git.kernel.org/stable/c/bff7b87dfa28a1502c18d0c6f1fadda5162fa854
• https://git.kernel.org/stable/c/4df5597c65446135362f72880995e8920f058fa0
• https://git.kernel.org/stable/c/e20d8922aa8fe441d291364c96c2179a005b79ea