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CVE-2026-64108

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=7.0.*, <=6.12.*, 6.12.78, <f2deaa2f409a4598eaa10f2a93a676c0632af248, 0, 7.0, <bdc349a87f1fb02c18c4071858a06542bfea783d, 0629a1a187e424373364d681b42b101894bdb548, 0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd, 6.12.92, <c68337442f03953237a94577beb468ab2662a851, 6.6.142, <6.18.34, <e1ffa6cf662383f95816eed1b623429d82675e75, <=6.6.*, 6.1.175, <7.0, <6.20, 6.18.34, 340cea84f691c5206561bb2e0147158fe02070be, 7.1, <=6.18.*, 7.0.11, <c7364cea52531534676b9f7dbc0a477c11f4c050, 30afc6ea72cc6cf7c8d579e79b64232801c38d08, 6.1.167, <=*, <6.6.142, 708c276f516d27beaded7f372ac8111cee43926c, <5e7d9d0805e58fa3760894e73115b7a74024fd07, <6.1.175, 6.19.10, <6.12.92, 6.6.130, f655467a9973f964b267871e5fef533ad5014494, 6.18.20

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: Fix busy dentry used after unmounting Since commit 340cea84f691c ("cifs: open files should not hold ref on superblock"), cifs file only holds the dentry ref_cnt, the cifs file close work(cfile->deferred) could be executed after unmounting, which will trigger a warning in generic_shutdown_super: BUG: Dentry 00000000a14a6845{i=c,n=file} still in use (1) [unmount of cifs cifs] The detailed processs is: process A process B kworker fd = open(PATH) vfs_open file->__f_path = *path // dentry->d_lockref.count = 1 cifs_open cifs_new_fileinfo cfile->dentry = dget(dentry) // dentry->d_lockref.count = 2 close(fd) __fput cifs_close queue_delayed_work(deferredclose_wq, cfile->deferred) dput(dentry) // dentry->d_lockref.count = 1 smb2_deferred_work_close _cifsFileInfo_put list_del(&cifs_file->flist) umount cleanup_mnt deactivate_super cifs_kill_sb cifs_close_all_deferred_files_sb cifs_close_all_deferred_files // cannot find cfile, skip _cifsFileInfo_put kill_anon_super generic_shutdown_super shrink_dcache_for_umount umount_check WARN ! // dentry->d_lockref.count = 1 cifsFileInfo_put_final dput(cifs_file->dentry) // dentry->d_lockref.count = 0 Fix it by flushing 'deferredclose_wq' before calling kill_anon_super. Fetch a reproducer in https://bugzilla.kernel.org/show_bug.cgi?id=221548.

Gravité et risque d'exploitation

CVE-2026-64108 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.13 %, ce qui la place devant 2.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=7.0.*, <=6.12.*, 6.12.78, <f2deaa2f409a4598eaa10f2a93a676c0632af248, 0, 7.0, <bdc349a87f1fb02c18c4071858a06542bfea783d, 0629a1a187e424373364d681b42b101894bdb548, 0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd, 6.12.92, <c68337442f03953237a94577beb468ab2662a851, 6.6.142, <6.18.34, <e1ffa6cf662383f95816eed1b623429d82675e75, <=6.6.*, 6.1.175, <7.0, <6.20, 6.18.34, 340cea84f691c5206561bb2e0147158fe02070be, 7.1, <=6.18.*, 7.0.11, <c7364cea52531534676b9f7dbc0a477c11f4c050, 30afc6ea72cc6cf7c8d579e79b64232801c38d08, 6.1.167, <=*, <6.6.142, 708c276f516d27beaded7f372ac8111cee43926c, <5e7d9d0805e58fa3760894e73115b7a74024fd07, <6.1.175, 6.19.10, <6.12.92, 6.6.130, f655467a9973f964b267871e5fef533ad5014494, 6.18.20) 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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