Bluetooth in Android 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before 2016-07-01 allows local users to gain privileges by establishing a pairing that remains present during a session of the primary user, aka internal bug 27410683.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.