Just to clarify, this is a vulnerability for cars with keyless entry. IE when you approach close enough to the car, it unlocks automatically if you have the key on your person, and you can start the car with the pushbutton without inserting a key. This attack makes the car consider "close enough" to be 100m instead of a few feet. If the key is inside your house a couple dozen meters away, the car unlocks automatically and you can drive it away.