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CVE-2026-72381

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.7%
Linux•Linux•Versions : <93d4d46bf9d442a12ea87278049ec416962c627f, 7.0.2, 7.1.5, 6.18.40, <=6.12.*, 712cdf917e77a6444ce3836874829d770db20ee6, c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d, 0, <fb978d72052704c6b06c6b0f129fcd60b77169f5, <=7.1.*, <ed98719be41389d416953b8ef9f07a07dfea6b2b, 49110a8ce654bbe56bef7c5e44cce31f4b102b8a, <7.1, <5a5ac2852cd326529d02f778bc1aa6184701f4d7, 6.18.25, 6.12.92, 6.6.142, 6.12.97, <=6.6.*, c908c853f304a4969b5aa10eba0b50350cc65b80, <6.18.40, 7.1, <=6.18.*, 6.6.145, <6.6.145, <=*, 00ce8d6789dae72d042a4522264964c72891ca37, <6.12.97, 7.2, <38637163501fd9e2f684b8cd275d0db5d79f37c6

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free of fp->owner.name in durable handle owner check Two concurrent SMB2 durable reconnects (DH2C/DHnC) on the same persistent_id race the fp->owner.name compare-read in ksmbd_vfs_compare_durable_owner() against the kfree() in ksmbd_reopen_durable_fd()'s reopen-success path. fp->owner.name is a standalone kstrdup() buffer whose lifetime is independent of the fp refcount, and the two sites share no lock: the compare reads the buffer while the reopen frees it, so the strcmp() can dereference freed memory. Commit 7ce4fc40018d ("ksmbd: fix durable reconnect double-bind race in ksmbd_reopen_durable_fd") made the fp->conn claim atomic under global_ft.lock (closing the owner.name double-free and the ksmbd_file write-UAF), but the compare-read versus reopen-free pair was left unserialized. BUG: KASAN: slab-use-after-free in strcmp+0x2c/0x80 Read of size 1 by task kworker strcmp ksmbd_vfs_compare_durable_owner smb2_check_durable_oplock smb2_open Freed by task kworker: kfree ksmbd_reopen_durable_fd smb2_open Allocated by task kworker: kstrdup session_fd_check smb2_session_logoff The buggy address belongs to the cache kmalloc-8 Serialize both sides of the race with fp->f_lock. The global durable file-table lock still protects the durable reconnect claim, but fp->owner.name is per-open state and does not need to block unrelated durable table lookups or reconnects. The teardown is left at its existing location after the reopen-success point so that an __open_id() rollback still retains owner.name for a later legitimate reconnect to verify.

Gravité et risque d'exploitation

CVE-2026-72381 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 0.65 %, ce qui la place devant 50.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <93d4d46bf9d442a12ea87278049ec416962c627f, 7.0.2, 7.1.5, 6.18.40, <=6.12.*, 712cdf917e77a6444ce3836874829d770db20ee6, c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d, 0, <fb978d72052704c6b06c6b0f129fcd60b77169f5, <=7.1.*, <ed98719be41389d416953b8ef9f07a07dfea6b2b, 49110a8ce654bbe56bef7c5e44cce31f4b102b8a, <7.1, <5a5ac2852cd326529d02f778bc1aa6184701f4d7, 6.18.25, 6.12.92, 6.6.142, 6.12.97, <=6.6.*, c908c853f304a4969b5aa10eba0b50350cc65b80, <6.18.40, 7.1, <=6.18.*, 6.6.145, <6.6.145, <=*, 00ce8d6789dae72d042a4522264964c72891ca37, <6.12.97, 7.2, <38637163501fd9e2f684b8cd275d0db5d79f37c6) 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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