[GeekyBear]

If your device tells you that you are required to enter your passcode (instead of having biometric authentication available) at a time when you have not just rebooted the device yourself, that would be your clue that something unusual is going on.

At which time you simply need to reboot the device yourself to clear anything made possible by this particular boot ROM bug.

[mantap]

iOS requires users to enter their passcode every week so they don't forget it.