Session Management Issue in Linux Kernel's SMB Server by Microsoft

CVE-2025-40285

What is CVE-2025-40285?

A vulnerability within the Linux kernel's SMB server was identified, where a reference count leak could occur in the ksmbd_session upon session reconnection. This issue arises from the failure to properly decrement the reference count when a session needs to be re-established, potentially leading to resource exhaustion over time. The problem has been addressed by implementing a call to ksmbd_user_session_put(), ensuring that references are correctly managed and preventing leaks that could affect system performance and stability.

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