Multiple integer overflows in app/aboot/aboot.c in the Qualcomm components in Android before 2016-07-05 on Nexus 5 and 7 (2013) devices allow attackers to bypass intended access restrictions via a crafted image, aka Android internal bug 28842418 and Qualcomm internal bug CR813930.
https://source.codeaurora.org/quic/la/kernel/lk/commit/?id=4f829bb52d0338c87bc6fbd0414b258f55cc7c62