The mach voucher subsystem fails to correctly handle spoofed no-more-senders messages. ipc_kobject_server will be called for mach messages sent to kernel-owned mach ports. If the msgh_id of the message can't be found in the mig_buckets hash table then this function calls ipc_kobject_notify. Note that this is the same code path which would be taken for a real no-more-senders notification message but there's nothing stopping user-space from also just sending one.
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