The Widevine QSEE TrustZone application in Android 5.x before 5.1.1 LMY49F and 6.0 before 2016-01-01 allows attackers to gain privileges via a crafted application that leverages QSEECOM access, aka internal bug 24441554.
http://www.securitytracker.com/id/1034592
http://source.android.com/security/bulletin/2016-01-01.html