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CVE-2026-72381: Linux

9.8

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 по мрежата, без особени условия, без вход и без действие от потребителя.

    Описание

    Оригинално описание

    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.

    Засегнати продукти

    • Linux Linux: 712cdf917e77a6444ce3836874829d770db20ee6 преди fb978d72052704c6b06c6b0f129fcd60b77169f5; c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d преди 93d4d46bf9d442a12ea87278049ec416962c627f; 00ce8d6789dae72d042a4522264964c72891ca37 преди 5a5ac2852cd326529d02f778bc1aa6184701f4d7; 49110a8ce654bbe56bef7c5e44cce31f4b102b8a преди ed98719be41389d416953b8ef9f07a07dfea6b2b; 49110a8ce654bbe56bef7c5e44cce31f4b102b8a преди 38637163501fd9e2f684b8cd275d0db5d79f37c6; c908c853f304a4969b5aa10eba0b50350cc65b80; 6.6.142 преди 6.6.145; 6.12.92 преди 6.12.97; 6.18.25 преди 6.18.40; 7.0.2 преди 7.1
    • Linux Linux: 7.1; преди 7.1; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

    История

    • 15 август 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-72381: Linux | freedomonline.bg