That's one of the reasons why the makers of the Librem 5 phone decided to use an internal USB bus which isolates the baseband from the SoC: > To isolate the ce

That's one of the reasons why the makers of the Librem 5 phone decided to use an internal USB bus which isolates the baseband from the SoC: > To isolate the cellular modem from the SoC, we will be placing the modem on the (remarkably fast) USB bus and have the phone interact with the cellular modem through USB instead of on the main RAM bus. This will separate the cellular modem on its own bus without seeing any other data. (https://puri.sm/posts/librem5-2018-09-hardware-report/ https://puri.sm/posts/librem5-2018-09-hardware-report/)