Integer overflow in app/aboot/aboot.c in the Qualcomm components in Android before 2016-07-05 on Nexus 5 devices allows attackers to bypass intended access restrictions via a crafted block count and block size of a sparse header, aka Android internal bug 28822465 and Qualcomm internal bug CR813933.
https://source.codeaurora.org/quic/la/kernel/lk/commit/?id=1321f34f1ebcff61ad7e65e507cfd3e9028af19b