In the Linux kernel, the following vulnerability has been resolved: staging: gpib: Fix Oops after disconnect in niusb If the usb dongle is disconnected subsequent calls to the driver cause a NULL dereference Oops as the businterface is set to NULL on disconnect. This problem was introduced by setting usbdev from the businterface for devxxx messages. Previously businterface was checked for NULL only in the the functions directly calling usbfillbulkurb or usbcontrolmsg. Check for valid businterface on all interface entry points and return -ENODEV if it is NULL.