media/libmedia/IOMX.cpp in mediaserver in Android 4.x before 4.4.4, 5.0.x before 5.0.2, 5.1.x before 5.1.1, and 6.x before 2016-04-01 does not initialize a parameter data structure, which allows attackers to obtain sensitive information from process memory, and consequently bypass an unspecified protection mechanism, via unspecified vectors, as demonstrated by obtaining Signature or SignatureOrSystem access, aka internal bug 26914474.