OwnStar will break into any GM vehicle equipped with OnStar, details to be revealed at DefCon next week.
GM claims they "have an update" that will "fix the vulnerability"
http://www.wired.com/2015/07/gadget-...-unlock-start/
In GM's defense, the device does not hack the vehicle directly, it hacks the APP on your Phone that you use to link to your car with.