CVE-2025-68803
Vulnérabilité élevée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: NFSv4 file creation neglects setting ACL An NFSv4 client that sets an ACL with a named principal during file creation retrieves the ACL afterwards, and finds that it is only a default ACL (based on the mode bits) and not the ACL that was requested during file creation. This violates RFC 8881 section 6.4.1.3: "the ACL attribute is set as given". The issue occurs in nfsd_create_setattr(), which calls nfsd_attrs_valid() to determine whether to call nfsd_setattr(). However, nfsd_attrs_valid() checks only for iattr changes and security labels, but not POSIX ACLs. When only an ACL is present, the function returns false, nfsd_setattr() is skipped, and the POSIX ACL is never applied to the inode. Subsequently, when the client retrieves the ACL, the server finds no POSIX ACL on the inode and returns one generated from the file's mode bits rather than returning the originally-specified ACL.
Gravité et risque d'exploitation
CVE-2025-68803 obtient un score CVSS de 8.0/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.51 %, ce qui la place devant 42.6 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions 6.12.64, <=6.1.*, <=6.12.*, <bf4e671c651534a307ab2fabba4926116beef8c3, 6.1.160, c5409ce523af40d5c3019717bc5b4f72038d48be, <75f91534f9acdfef77f8fa094313b7806f801725, 0, c0cbe70742f4a70893cd6e5f6b10b6e89b6db95b, 5.15.154, <5.15.198, 5.15.198, <=5.10.*, <=6.6.*, <913f7cf77bf14c13cfea70e89bcb6d0b22239562, 6.0, 6.18.3, <6.0, <381261f24f4e4b41521c0e5ef5cc0b9a786a9862, <5.10.248, d52acd23a327cada5fb597591267cfc09f08bb1d, <=6.18.*, 5.10.248, <=*, <c182e1e0b7640f6bcc0c5ca8d473f7c57199ea3d, <60dbdef2ebc2317266a385e4debdb1bb0e57afe1, <=5.15.*, 6.19, 6.6.121, <214b396480061cbc8b16f2c518b2add7fbfa5192, 5.10.220) 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/c182e1e0b7640f6bcc0c5ca8d473f7c57199ea3d
- https://git.kernel.org/stable/c/75f91534f9acdfef77f8fa094313b7806f801725
- https://git.kernel.org/stable/c/60dbdef2ebc2317266a385e4debdb1bb0e57afe1
- https://git.kernel.org/stable/c/381261f24f4e4b41521c0e5ef5cc0b9a786a9862
- https://git.kernel.org/stable/c/bf4e671c651534a307ab2fabba4926116beef8c3
- https://git.kernel.org/stable/c/214b396480061cbc8b16f2c518b2add7fbfa5192
- https://git.kernel.org/stable/c/913f7cf77bf14c13cfea70e89bcb6d0b22239562