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CVE-2026-68099

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : 7.0.2, <=6.1.*, 41e53a773db6342ac9a689ee5ba635c31744c9f0, <=6.12.*, e1955a94b6f17f4b058afa955a6f187eb3ed7615, <8f3a7a499a7d9bb1c0f33fe78c4a4594d7e307f4, 6.12.101, 0, <6.6.148, <0bf38372821b1526f31538a7d9811844c55c7f38, <=7.1.*, <7.1, 6.18.25, <6.12.101, <=6.6.*, <bbf0a8e931204ecdab494a88d43b0a24a04285c5, 6.1.175, 6.6.136, 299f962c0b02d048fb45d248b4da493d03f3175d, 6.18.42, ef7902be3f215b6bf7babe4dc9dd9a7d57dad7a7, 7.1.6, 8d5729350b236896f51379588d9a690b7fafb8db, 6.12.84, 7.1, <=6.18.*, 6.1.184, <6.1.184, <6.18.42, <f4fcd0c1a243d449307b887fafee23921e9db5ab, <bc90144ce8bb7fcf05ad9417c7adb4e9509d9e13, <=*, <847ecd4eb3c117c3d2f13f1e7ab506543aad8183, 5e7b8f3c539d69b2ed5f2408e2f75e68ce7eef43, 6.6.148, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: restore DACL size on check_add_overflow() to avoid malformed ACL check_add_overflow() unconditionally writes the truncated sum into *d even on overflow, per its contract in include/linux/overflow.h. The four check_add_overflow() guards in set_posix_acl_entries_dacl() and set_ntacl_dacl() break out of the ACE-building loops on overflow, but the truncated *size is then consumed downstream at the end of set_ntacl_dacl(): pndacl->size = cpu_to_le16(le16_to_cpu(pndacl->size) + size); This produces an on-wire NT ACL whose pndacl->size under-reports the bytes actually written by the preceding fill_ace_for_sid()/memcpy() calls, yielding a malformed ACL that can trigger out-of-bounds reads when re-parsed by clients or ksmbd itself. Restore *size to its pre-addition value on each overflow branch (via `*size -= ace_sz` / `size -= nt_ace_size`) so that after the break, *size once again holds the cumulative size of the successfully-written ACEs. The committed ACL is then truncated-but-self-consistent rather than malformed. The ksmbd DACL builders are the only check_add_overflow() sites found where an overflow path breaks out of a loop and the destination value is consumed afterward. The other nearby break-style cases either return -EINVAL on overflow (transport_ipc.c) or break without consuming the overflowed destination value afterward (buildid.c).

Gravité et risque d'exploitation

CVE-2026-68099 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 6.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 7.0.2, <=6.1.*, 41e53a773db6342ac9a689ee5ba635c31744c9f0, <=6.12.*, e1955a94b6f17f4b058afa955a6f187eb3ed7615, <8f3a7a499a7d9bb1c0f33fe78c4a4594d7e307f4, 6.12.101, 0, <6.6.148, <0bf38372821b1526f31538a7d9811844c55c7f38, <=7.1.*, <7.1, 6.18.25, <6.12.101, <=6.6.*, <bbf0a8e931204ecdab494a88d43b0a24a04285c5, 6.1.175, 6.6.136, 299f962c0b02d048fb45d248b4da493d03f3175d, 6.18.42, ef7902be3f215b6bf7babe4dc9dd9a7d57dad7a7, 7.1.6, 8d5729350b236896f51379588d9a690b7fafb8db, 6.12.84, 7.1, <=6.18.*, 6.1.184, <6.1.184, <6.18.42, <f4fcd0c1a243d449307b887fafee23921e9db5ab, <bc90144ce8bb7fcf05ad9417c7adb4e9509d9e13, <=*, <847ecd4eb3c117c3d2f13f1e7ab506543aad8183, 5e7b8f3c539d69b2ed5f2408e2f75e68ce7eef43, 6.6.148, 7.2) 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

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