CVE-2026-90102
Vulnérabilité élevée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: NFSv4/pnfs: key the data server cache on the NFS version nfs4_pnfs_ds_add() keys the per-net data server cache on the multipath address set alone, and struct nfs4_pnfs_ds records no version. That suffices for the files layout driver, which always connects with version 4, but flexfiles takes its version tuple from GETDEVICEINFO per device, and one address can legitimately serve both NFSv3 and NFSv4. Two deviceids on one address with different ds_versions[0].version therefore share a single nfs4_pnfs_ds, and whichever mirror connects first pins ds_clp to its own version. The other one is handed that client anyway, so it selects rpc_call_ops for a version the connection does not speak, and the mismatched sequence-slot handling dereferences NULL. Add the version to the cache key so the two cannot alias, giving each version its own nfs4_pnfs_ds and connection while both mirrors stay usable. Only the major version is compared, since that is what selects rpc_call_ops and rpc_ops; v4.0 and v4.1 keep sharing a client. The files layout driver passes the 4 it already hardcodes at connect time.
Gravité et risque d'exploitation
CVE-2026-90102 obtient un score CVSS de 7.5/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.70 %, ce qui la place devant 52.1 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 5.15.221, 5.10.270, 0, <f2994ba1263d9e88d3d9ae1d097c5cf811d4bfa5, <bc7aa9d8aff826031ffe25eba7f2f3acafcbf7a1, <bbc975cfb07a146843fde1126c43441e76177539, 6.1.188, 6.18.52, <13c23c5cb977f66390795437fd3837887ce1fd75, <4.0, <=5.10.*, <=6.6.*, 4.0, 6.6.157, 7.2.6, d67ae825a59d639e4d8b82413af84d854617a87e, <27f640cd92eebf5c2f64336be7ca24f4636390cb, <=6.18.*, <dd5bd091daa48c6ed8f9235ddf448aa288a0881f, 6.12.110, <=7.2.*, <ffb100b0da0e217d5d63ce6fe092f9c29e59f7dd, <02e160922bc83cd25e346a028ed43cbdb0b57e1a, <=*, <=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/ffb100b0da0e217d5d63ce6fe092f9c29e59f7dd
- https://git.kernel.org/stable/c/02e160922bc83cd25e346a028ed43cbdb0b57e1a
- https://git.kernel.org/stable/c/bc7aa9d8aff826031ffe25eba7f2f3acafcbf7a1
- https://git.kernel.org/stable/c/dd5bd091daa48c6ed8f9235ddf448aa288a0881f
- https://git.kernel.org/stable/c/f2994ba1263d9e88d3d9ae1d097c5cf811d4bfa5
- https://git.kernel.org/stable/c/27f640cd92eebf5c2f64336be7ca24f4636390cb
- https://git.kernel.org/stable/c/bbc975cfb07a146843fde1126c43441e76177539
- https://git.kernel.org/stable/c/13c23c5cb977f66390795437fd3837887ce1fd75
