We're fucked, deep and good: https://www.armis.com/blueborne/
TD;DR: wireless, interaction-free, man-in-the-middle and remote code execution zero-day exploits - in the bluetooth stack, no pairing needed.
Affected devices, as long as you have Bluetooth active:
Android: basically all in existance = remote code execution as root
Windows: everything since vista = MitM - patch available for windows 7+ (vista users can bin the OS) through windows update
Linux: everything since October 2011 (kernel >= 3.3-rc1) = remote code execution as root
iOS: iOS<9.3.5 AppleTV<7.2.2 = remote code execution as root (newer versions possibly affected through memory corruption in low energy audio protocol)
Better turn OFF bluetooth in all your affected devices, NOW, until it becomes clear how to mitigate this.