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CVE-2026-53383: Linux

7.5

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: reject non-VALID session in compound request branch smb2_check_user_session() takes a shortcut for any operation that is not the first in a COMPOUND request: it reuses work->sess (the session bound by the first operation) and validates only the SessionId, then returns "valid". It never re-checks work->sess->state == SMB2_SESSION_VALID, and a SessionId of 0xFFFFFFFFFFFFFFFF (ULLONG_MAX, the MS-SMB2 related-operation value) skips even the id comparison. The standalone path (ksmbd_session_lookup_all() plus the SESSION_SETUP state machine) does enforce the VALID state; the compound branch bypasses all of it. A SESSION_SETUP carrying only an NTLM Type-1 (NtLmNegotiate) blob publishes a fresh SMB2_SESSION_IN_PROGRESS session whose sess->user is still NULL (->user is assigned later, by ntlm_authenticate()). Used as operation 1 of a COMPOUND with operation 2 = TREE_CONNECT (related, SessionId=ULLONG_MAX, \\host\IPC$), the tree-connect then runs on that IN_PROGRESS session and reaches ksmbd_ipc_tree_connect_request(), which dereferences user_name(sess->user) with sess->user == NULL (transport_ipc.c:687/701/704) -> remote NULL-pointer dereference and a kernel Oops that wedges the ksmbd worker for all clients. Reject any non-first compound operation that lands on a session which is not SMB2_SESSION_VALID, mirroring the validity the standalone lookup path enforces. SESSION_SETUP itself legitimately runs on an IN_PROGRESS session, but it is never carried as a non-first compound operation, so multi-leg authentication is unaffected by this check.

    Засегнати продукти

    • Linux Linux: eb947403518ea3d93f6d89264bb1f5416bb0c7d0 преди 25ff12b82a376ff5c4583102a63d2456a6b9ebb9; 854156d12caa9d36de1cf5f084591c7686cc8a9d преди fc578523a72cb8b329d32070b95898e81613cc3f; 5005bcb4219156f1bf7587b185080ec1da08518e преди d2bbbb6c55812220fee5d801c275cc267ea3cbeb; 5005bcb4219156f1bf7587b185080ec1da08518e преди 8f0302fb691537d33ec8f668565257ea9d340ffe; 5005bcb4219156f1bf7587b185080ec1da08518e преди 7cad3ceaf679c55bc9946685dacafce78ce6b51a; 5005bcb4219156f1bf7587b185080ec1da08518e преди 06e1f05a1dbe8bbd054c0927b17fc0a61cc8bef7; 5005bcb4219156f1bf7587b185080ec1da08518e преди 5f983b864d3d473ac533b2f4f44a1bbe5dcbccf4; 5005bcb4219156f1bf7587b185080ec1da08518e преди 609ca17d869d04ba249e32cdcbf13c0b1c66f43c; d1066c1b3663401cd23c0d6e60cdae750ce00c0f; 5.15.121 преди 5.15.211; 6.1.36 преди 6.1.177; 6.3.10 преди 6.4
    • Linux Linux: 6.4; преди 6.4; 5.15.211 до 5.15.*; 6.1.177 до 6.1.*; 6.6.144 до 6.6.*; 6.12.95 до 6.12.*; 6.18.37 до 6.18.*; 7.0.14 до 7.0.*; 7.1.2 до 7.1.*; от 7.2 нататък

    История

    • 19 юли 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-53383: Linux | freedomonline.bg