The clie_5_attach function in drivers/usb/serial/visor.c in the Linux kernel through 4.4.1 allows physically proximate attackers to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by inserting a USB device that lacks a bulk-out endpoint.
Exploitability
AV:PAC:LPR:NUI:NScope
S:UImpact
C:NI:NA:H4.6/CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H