CVE-2026-31717
HighCVSS 8.8Summary
W jądrze Linuxa zidentyfikowano podatność w ksmbd, która nie weryfikuje, czy użytkownik próbujący ponownie połączyć się z trwałym uchwytem jest tym samym użytkownikiem, który pierwotnie otworzył plik. To umożliwia każdemu uwierzytelnionemu użytkownikowi przejęcie osieroconego trwałego uchwytu poprzez przewidywanie lub łamanie identyfikatora.
Risk Assessment
Podatność ta stwarza ryzyko przejęcia dostępu do plików przez nieautoryzowanych użytkowników, co może prowadzić do wycieku danych lub nieautoryzowanych modyfikacji. Organizacje powinny być świadome potencjalnych zagrożeń związanych z bezpieczeństwem danych.
Recommendation
Zaleca się aktualizację jądra Linuxa do najnowszej wersji, która zawiera poprawki dla tej podatności. Dodatkowo, warto wdrożyć monitorowanie i audyt dostępu do plików, aby zminimalizować ryzyko nieautoryzowanego dostępu.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate owner of durable handle on reconnect Currently, ksmbd does not verify if the user attempting to reconnect to a durable handle is the same user who originally opened the file. This allows any authenticated user to hijack an orphaned durable handle by predicting or brute-forcing the persistent ID. According to MS-SMB2, the server MUST verify that the SecurityContext of the reconnect request matches the SecurityContext associated with the existing open. Add a durable_owner structure to ksmbd_file to store the original opener's UID, GID, and account name. and catpure the owner information when a file handle becomes orphaned. and implementing ksmbd_vfs_compare_durable_owner() to validate the identity of the requester during SMB2_CREATE (DHnC).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

