The vold volume manager daemon on Android 3.0 and 2.x before 2.3.4 trusts messages that are received from a PFNETLINK socket, which allows local users to execute arbitrary code and gain root privileges via a negative index that bypasses a maximum-only signed integer check in the DirectVolume::handlePartitionAdded method, which triggers memory corruption, as demonstrated by Gingerbreak.

In BroadcastController.java of registerReceiverWithFeatureTraced, there is a possible way to receive broadcasts meant for the "android" package due to improper input validation. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.