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CVE-2026-64108: Linux

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    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.

    Засегнати продукти

    • Linux Linux: 708c276f516d27beaded7f372ac8111cee43926c преди c7364cea52531534676b9f7dbc0a477c11f4c050; 0629a1a187e424373364d681b42b101894bdb548 преди bdc349a87f1fb02c18c4071858a06542bfea783d; 0e4b8faaaebe3137bec5723ef2b3cb0437fb38fd преди f2deaa2f409a4598eaa10f2a93a676c0632af248; f655467a9973f964b267871e5fef533ad5014494 преди 5e7d9d0805e58fa3760894e73115b7a74024fd07; 340cea84f691c5206561bb2e0147158fe02070be преди e1ffa6cf662383f95816eed1b623429d82675e75; 340cea84f691c5206561bb2e0147158fe02070be преди c68337442f03953237a94577beb468ab2662a851; 30afc6ea72cc6cf7c8d579e79b64232801c38d08; 6.1.167 преди 6.1.175; 6.6.130 преди 6.6.142; 6.12.78 преди 6.12.92; 6.18.20 преди 6.18.34; 6.19.10 преди 6.20
    • Linux Linux: 7.0; преди 7.0; 6.1.175 до 6.1.*; 6.6.142 до 6.6.*; 6.12.92 до 6.12.*; 6.18.34 до 6.18.*; 7.0.11 до 7.0.*; 7.1 до *

    История

    • 19 юли 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-64108: Linux | freedomonline.bg