ksmbd: pin conn during async oplock break notification

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CVE-2026-68381

CVE-2026-68381 affects the Linux kernel ksmbd (SMB server) and describes a race between connection teardown and asynchronous oplock/lease break notifications. The vulnerability occurs when a ksmbd_conn pointer is stored in an async work item and queued on ksmbd-io; the work only increments conn-&...