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1: Infotainment and nav, obviously. Typically two notable processors in here, one low-level microcontroller handling the CAN/whatever communication with the vehicle, in theory this is very strict about what it sends and receives. In practice, who knows. The second is typically a big multicore ARM running either Linux or Windows Embedded and handling the GUI, navigation, multimedia, bluetooth, and phone display mirroring. It's very much possible to bypass security and run new software on these through the USB port. And as you said, in the Jeep hack (quite old now, that was 2015) broke this remotely by coming through...
They could control everything. Maybe it was jot completely publicly disclosed, but on any vehicle with radar cruise that can correct steering (a lot of vehicles), CAN BUS has access to full wheel control. Check out the https://comma.ai for what is possible from CAN.
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