codecs/amrnb/dec/SoftAMR.cpp in libstagefright 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 2016-05-01 does not validate buffer sizes, which allows attackers to gain privileges via a crafted application, as demonstrated by obtaining Signature or SignatureOrSystem access, aka internal bugs 27662364 and 27843673.
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.