http://www.pcgamer.com/newly-discovered-bluetooth-vulnerability-exposes-billions-of-devices/

Using Bluetooth is a convenient way to exchange data between devices and to connect wireless peripherals. It is supported on billions of desktop PCs, laptops, phones, and other devices, most of which are susceptible to a new attack vector that dubbed "BlueBorne."

What makes BlueBorne so dangerous is that it does not require any interaction with a device's user. Simply having Bluetooth turned on is enough for BlueBorne to work its malicious magic. Just as frightening is that it can spread through the air and attack other nearby devices, a trait that has drawn comparisons to the WannaCry ransomware that initially spread like wildfire.