decoder/ih264d_process_intra_mb.c in mediaserver in Android 6.x before 2016-07-01 mishandles intra mode, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted media file, aka internal bug 28165659.
https://android.googlesource.com/platform/external/libavc/+/a583270e1c96d307469c83dc42bd3c5f1b9ef63f