CVE-2026-90151

Description

In the Linux kernel, the following vulnerability has been resolved: NFSv4: remove callback IDR entry on client allocation failure nfs4_alloc_client() allocates an NFSv4.0 callback identifier before it finishes setting up the client. If any later initialization step fails, the error path frees the nfs_client directly with nfs_free_client(). That bypasses nfs_put_client(), which is where the callback IDR entry is removed during normal teardown. A failed allocation can therefore leave cb_ident_idr pointing at a freed nfs_client. A later NFSv4.0 callback lookup by cb_ident would find the stale pointer and take a reference to it. Make the callback IDR removal helper callable by the allocation failure path, and remove the callback identifier before freeing the client. This was found by a local static-analysis checker for publish-before-free lifetime bugs and confirmed by manual inspection.

Gravité et risque d'exploitation

CVE-2026-90151 obtient un score CVSS de 9.8/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.74 %, ce qui la place devant 53.7 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <3f2387e8bfbc4efda5d77c3a11a028d0a119c48f, <=6.1.*, <=6.12.*, <68c721391b761dbe38d5b0094d2bb6e8489ad92b, <fc95ca82d5ae598c428ab5a00ae69f8526d59371, 5.15.221, <7c4812eb96bdcafb31a65b12f2aa96659429d1d4, 5.10.270, 0, <2.6.38, <d05c2007b3d84ccba11dc6e9cb3202768cc72f14, f4eecd5da3422e82e88e36c33cbd2595eebcacb1, 6.1.188, 6.18.52, <5891c03e150920618db0e9c4ea2d772abacdcfd1, <80b1c3d5a881f7d9081aa9f46da9742878a0f893, <=5.10.*, <=6.6.*, 6.6.157, 2.6.38, 7.2.6, <=6.18.*, 6.12.110, <=7.2.*, <9bfdd0f591307b5198826a0e7a5b2f35f87acd2d, <=*, <=5.15.*, 7.3) 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/68c721391b761dbe38d5b0094d2bb6e8489ad92b
• https://git.kernel.org/stable/c/9bfdd0f591307b5198826a0e7a5b2f35f87acd2d
• https://git.kernel.org/stable/c/7c4812eb96bdcafb31a65b12f2aa96659429d1d4
• https://git.kernel.org/stable/c/fc95ca82d5ae598c428ab5a00ae69f8526d59371
• https://git.kernel.org/stable/c/80b1c3d5a881f7d9081aa9f46da9742878a0f893
• https://git.kernel.org/stable/c/3f2387e8bfbc4efda5d77c3a11a028d0a119c48f
• https://git.kernel.org/stable/c/5891c03e150920618db0e9c4ea2d772abacdcfd1
• https://git.kernel.org/stable/c/d05c2007b3d84ccba11dc6e9cb3202768cc72f14