app/aboot/aboot.c in the Qualcomm components in Android before 2016-07-05 on Nexus 5 devices does not properly check for an integer overflow, which allows attackers to bypass intended access restrictions via crafted start and size values, aka Android internal bug 28820720 and Qualcomm internal bug CR681957, a related issue to CVE-2014-4325.

The cmd_boot function in app/aboot/aboot.c in the Little Kernel (LK) bootloader, as distributed with Qualcomm Innovation Center (QuIC) Android contributions for MSM devices and other products, allows attackers to bypass intended device-lock and kernel-signature restrictions by using fastboot mode in a boot command for an arbitrary kernel image.