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CVE-2026-90162: 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: defer publishing granted locks to prevent UAF/double-free race In smb2_lock(), mid-batch granted locks are published to connection-wide (conn->lock_list) and file-wide (fp->lock_list) lists immediately upon vfs_lock_file() success, while also remaining tracked on the stack-local rollback_list. If a subsequent element in the same SMB2_LOCK request array fails validation or execution, the thread jumps to out: and walks rollback_list to undo previously granted locks. However, because the granted lock was already published to conn->lock_list, a concurrent UNLOCK request on the same connection can find the lock object and kfree() it before the rollback loop executes. When the granting thread subsequently walks rollback_list, it dereferences and frees the already-freed ksmbd_lock structure, resulting in a Use-After-Free and Double-Free (on both ksmbd_lock and struct file_lock). Fix this by deferring the publication of granted locks to conn->lock_list and fp->lock_list until after the entire array of lock elements has been processed without error. Mid-batch grants remain tracked exclusively on the request-local rollback_list until the whole batch succeeds, eliminating the race window.

    Засегнати продукти

    • Linux Linux: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди f1371a140722c1d6868f9acf69d601de7d4142bf; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди b68d4bb6b03a667c305626bd2c242fd162bac17e; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 65f54ed0289e9a57e6c60b14347ccea4c318f1fc; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди ff6870cf3b7eccc69d03cbb6f23e3995d96e9a8d; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди a1d26dfb32919088e3638dca01068df3c4507433; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 преди 29f74f0f2e6df3b393b7b66e810136d0c64e3c59
    • Linux Linux: 5.15; преди 5.15; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.18.57 до 6.18.*; 7.2.6 до 7.2.*; от 7.3 нататък

    История

    • 17 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-90162: Linux | freedomonline.bg