CVE-2026-72252

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo: don't leak bad clone into future transaction On memory allocation failure the cloned nft_pipapo_match can enter a bad state: - some fields can have their lookup tables resized while others did not - bits might have been toggled - scratch map can be undersized which also means m->bsize_max can be lower than what is required This means that the next insertion in the same batch can trigger out-of-bounds writes. Furthermore, a failure in the first can result in the bad clone to leak into the next transaction because the abort callback is never executed in this case (the upper layer saw an error and no attempt to allocate a transactional request was made). Record a state for the nft_pipapo_match structure: - NEW (pristine clone) - MOD (modified clone with good state) - ERR (potentially bogus content) Then make it so that deletes and insertions fail when the clone entered ERR state. In case the very first insert attempt results in an error, free the clone right away.

Gravité et risque d'exploitation

CVE-2026-72252 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 5.8 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <047e813324eac2ac60cddfb58bcdbd0144eadb09, <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, <0ab7b1802f63ca5b288ea59acb467830b83abd6b, 3c4287f62044a90e73a561aa05fc46e62da173da, 5.15.217, 0, <=7.1.*, <cc53703f48558896295f565cd4f5e956d21b7af4, <02b6b0e892aea582590671796fd6eff5b93ea93f, 5.6, 6.12.97, <=6.6.*, <=6.18.*, 6.1.184, <5.6, <=*, <=5.15.*, <610e3b73efaec3dd81a95dcda2421ad7d9795bd0, <e74f9680e1b64872a51cc7b5bda1edaaa08aa51f, 6.6.148, 7.2, <47e65eff50691f0a5b79d325e28d83ec1da43bcf) 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/0ab7b1802f63ca5b288ea59acb467830b83abd6b
• https://git.kernel.org/stable/c/cc53703f48558896295f565cd4f5e956d21b7af4
• https://git.kernel.org/stable/c/047e813324eac2ac60cddfb58bcdbd0144eadb09
• https://git.kernel.org/stable/c/610e3b73efaec3dd81a95dcda2421ad7d9795bd0
• https://git.kernel.org/stable/c/02b6b0e892aea582590671796fd6eff5b93ea93f
• https://git.kernel.org/stable/c/e74f9680e1b64872a51cc7b5bda1edaaa08aa51f
• https://git.kernel.org/stable/c/47e65eff50691f0a5b79d325e28d83ec1da43bcf