drivers/char/diag/diagfwd.c in the Qualcomm components in Android before 2016-08-05 on Nexus 5, 5X, 6, 6P, and 7 (2013) devices mishandles certain integer values, which allows attackers to gain privileges via a crafted application, aka Android internal bug 28767796 and Qualcomm internal bug CR483408.
https://source.codeaurora.org/quic/la/kernel/msm/commit/?id=7efd393ca08ac74b2e3d2639b0ad77da139e9139