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A comment on Now your car is a cybersecurity risk, too. Parent comment

Re:Now your car is a cybersecurity risk, too by HPsquared on Friday May 21, 2021 @12:55PM (#27236606)
The trouble is, the sound system is inevitably connected to the rest of the car. For example, in most cars the volume automatically increases with vehicle speed to compensate for increased road noise.

These connections could be physically 'one-way' but in practice most modules are simply wired in parallel on a CAN bus and something like the radio would be set up to send data to the car's CAN bus (for diagnostic purposes at least).

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Re:Now your car is a cybersecurity risk, too by barefootcoder on Friday May 21, 2021 @06:09PM (#27240590)
More than just speed sensitive volume now. Replacing the stereo in my van requires a conversion box (Maestro) that deals with the various car settings that are done through the stereo, such as dome lights out duration, dash clock setting, auto door locking, etc.

The stereo is way too tightly coupled with the rest of the vehicle.

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