A service bulletin (pdf) issued on July 16 deals with "radio enhancements" and applies to various Ram, Grand Cherokee, Durango, Viper and Cherokee vehicles equipped with Uconnect 8.4A AM/FM/BT/ACCESS and Uconnect 8.4AN AM/FM/BT/ACCESS/NAV.
This comes after some well know hackers demonstrated wirelessly hacking a Jeep Cherokee
They came up with a zero-day exploit that "can target Jeep Cherokees and give the attacker wireless control, via the Internet, to any of thousands of vehicles. Their code is an automaker's nightmare: software that lets hackers send commands through the Jeep's entertainment system to its dashboard functions, steering, brakes, and transmission, all from a laptop that may be across the country."
Miller and Valasek's full arsenal includes functions that at lower speeds fully kill the engine, abruptly engage the brakes, or disable them altogether. The most disturbing maneuver came when they cut the Jeep's brakes, leaving me frantically pumping the pedal as the 2-ton SUV slid uncontrollably into a ditch. The researchers say they're working on perfecting their steering control—for now they can only hijack the wheel when the Jeep is in reverse. Their hack enables surveillance too: They can track a targeted Jeep's GPS coordinates, measure its speed, and even drop pins on a map to trace its route.
Remotely hacking a vehicle is possible due to a vulnerability in Uconnect systems which "brings your world into your vehicle using WiFi+ access, personalized app, local search guides and more." It basically adds vehicles to the Internet of Things. Entertainment, phone, navigation, voice commands and controls are listed under the "about Uconnect" section.