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CVE-2026-31718: 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 in __ksmbd_close_fd() via durable scavenger When a durable file handle survives session disconnect (TCP close without SMB2_LOGOFF), session_fd_check() sets fp->conn = NULL to preserve the handle for later reconnection. However, it did not clean up the byte-range locks on fp->lock_list. Later, when the durable scavenger thread times out and calls __ksmbd_close_fd(NULL, fp), the lock cleanup loop did: spin_lock(&fp->conn->llist_lock); This caused a slab use-after-free because fp->conn was NULL and the original connection object had already been freed by ksmbd_tcp_disconnect(). The root cause is asymmetric cleanup: lock entries (smb_lock->clist) were left dangling on the freed conn->lock_list while fp->conn was nulled out. To fix this issue properly, we need to handle the lifetime of smb_lock->clist across three paths: - Safely skip clist deletion when list is empty and fp->conn is NULL. - Remove the lock from the old connection's lock_list in session_fd_check() - Re-add the lock to the new connection's lock_list in ksmbd_reopen_durable_fd().

    Засегнати продукти

    • Linux Linux: 8df4bcdb0a4232192b2445256c39b787d58ef14d преди 0000a7780e0e446a28a273572f6ea8f7f582f694; c8efcc786146a951091588e5fa7e3c754850cb3c преди e33c65f011980b4ad4abfd93585ec2079856368f; c8efcc786146a951091588e5fa7e3c754850cb3c преди 3d6682726c2d3a46d31dae88b8166786b09b03ad; c8efcc786146a951091588e5fa7e3c754850cb3c преди b34fc42cfe922e551f7a27d3ac3bb016e41d7dd9; c8efcc786146a951091588e5fa7e3c754850cb3c преди 235e32320a470fcd3998fb3774f2290a0eb302a1; 6.6.32 преди 6.6.140
    • Linux Linux: 6.9; преди 6.9; 6.6.140 до 6.6.*; 6.12.84 до 6.12.*; 6.18.25 до 6.18.*; 7.0.2 до 7.0.*; от 7.1 нататък

    История

    • 1 май 2026 Публикувано

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