L8437 The advantage of the phone being powered off is that the memory will rapidly begin to degrade. The advantage of the phone being rebooted is that the firmware or OS can zero the memory explicitly. Aside from improved usability, another reason we prefer to reboot is because we're going to be doing explicit zeroing of all memory at boot for the OS similar to how fastboot mode now does it based on our proposal. This provides an opportunity to zero anything not already zeroed as part of our zero-on-free implementation which zeroes the freed allocations and freed pages as part of the process of ending the OS running.
Vulnerabilities exploited in the wild fixed based on GrapheneOS reports