CVE-2016-10277

Imagine the bootloader as the “startup control room” that runs before Android fully starts. This bug can let a harmful app, after a user interacts with it, break into that startup control room and run its own code with the highest device authority. The likely outcome is serious—damage that may not be fixable without a factory reset or reflash.

This matters if you run or manage Motorola Android devices that are on (or based on) Kernel 3.10 or Kernel 3.18 and users can install apps. The attack does not require prior permissions, but it does require user interaction to trigger, so the risk is highest where untrusted apps could be installed or used. The device is only at risk if it matches those kernel/bootloader conditions and a malicious app can be installed and then triggered by a user.

This should be treated as urgent for affected Motorola devices because it can let a local app gain bootloader-level control and cause permanent damage that may require factory reset. While it’s not confirmed as a CISA KEV item in the findings, public exploit code exists and the issue has sufficient real-world attention to warrant prompt patching for any devices that match the Kernel 3.10/3.18 condition.

Confirm exposure

1. Identify the device model and maker: Confirm it’s a Motorola Android device (not just Android in general).
2. Check the kernel version: Verify whether it uses Kernel 3.10 or Kernel 3.18.
3. Check patch level: Confirm the Android security patch level currently installed.

Determine if it’s likely exploitable

• The findings indicate the preconditions are (a) Motorola bootloader based on Kernel 3.10 or 3.18 and (b) the attacker can install a malicious local application.
• The exploit also requires user interaction to trigger, meaning the biggest real-world risk is devices where users can be tricked into installing or launching untrusted apps.

Upgrade / fixed version guidance

• Use the Android Security Bulletin fix dated 2017-05-01 as your reference point. Upgrade the Motorola/Android firmware so the device includes the security update from that bulletin (or a later one that includes the same changes).

Temporary mitigations (if you can’t patch immediately)

• Stop untrusted installs: Restrict app installation to approved sources, and if you have device management, use an allow-list for approved apps.
• Reduce user-triggered risk: Train/alert users not to install unknown apps, since user interaction is required.

What to monitor

• Post-update behavior: Look for unexpected reboots, boot loops, or sudden need for factory reset/reflash.
• App install/launch events: If you have MDM or logging, review for installations of unknown apps shortly before any device instability.

KEV / timing notes

• The findings show not listed in CISA KEV; however, there is public exploit availability, so patching remains important for affected devices.

CVE-2016-10277 is a local elevation-of-privilege (CWE-264) issue affecting the Motorola bootloader on Android devices that use bootloaders based on Kernel 3.10 or Kernel 3.18. The mechanism is that a malicious app installed locally can, once triggered with user interaction, execute arbitrary code in the bootloader context—i.e., with extremely high authority during the device startup process. The findings indicate this can lead to permanent compromise requiring factory reset/reflash.

Exploitation status: the findings state public exploit available (1 known) and press attention is rising; no KEV entry is present in the findings. EPSS was predicted (with a falling trend), but because KEV/news confirmation of exploitation is not provided here, the operational guidance is based on the stated exploit availability and the device matching preconditions.

Attack vector summary from findings: Local attacker capability (must be able to install a malicious app), no prior authentication required, and user interaction required to trigger.