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CVE-2026-64396: Linux

8.8

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, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix UAF of struct file_lock in SMB2_LOCK deferred-lock cancellation When a blocking byte-range lock request is deferred in the FILE_LOCK_DEFERRED path, ksmbd registers the asynchronous work into the connection's async_requests list via setup_async_work(). The cancel callback smb2_remove_blocked_lock() holds a reference to the flock. If the lock waiter is subsequently woken up but the work state is no longer KSMBD_WORK_ACTIVE (e.g., due to a concurrent cancellation), the cleanup path calls locks_free_lock(flock) without dequeuing the work from the async_requests list. Concurrently, smb2_cancel() walks the list under conn->request_lock and invokes the cancel callback, which then dereferences the already freed 'flock'. This leads to a slab-use-after-free inside __wake_up_common. Fix this by restructuring the cleanup logic after the worker returns from ksmbd_vfs_posix_lock_wait(). Move list_del(&smb_lock->llist) and release_async_work(work) to the top of the cleanup block. This guarantees that the async work is completely dequeued and serialized under conn->request_lock before locks_free_lock(flock) is called, rendering the flock unreachable for any concurrent smb2_cancel().

    Засегнати продукти

    • Linux Linux: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 367c42a611fe488b7b03f1f6737f4dee0e8b20a2; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 7703fd9aba1f2483c8e55f9ff73b7663e0761ed9; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 463bbd79698513af4dad50fe1c573825f297ca2e; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 5aa1cb01155f96824003baf7997cdf1f150caba3; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 5c75275c0fc9a2deb0d8f5604edcb16f288171c8; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди d20d1c8ba5765d1d12eefc0aee6385ab3f240e1e
    • Linux Linux: 5.15; преди 5.15; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.96 до 6.12.*; 6.18.39 до 6.18.*; 7.1.4 до 7.1.*; от 7.2 нататък

    История

    • 25 юли 2026 Публикувано

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