Linux is a modular kernel. I'm not aware of a single thing you can't disable or make modular during config/compile.
I woudn't like to be the guy who's medical equipment killed him by slowly decreasing his oxygen levels due to buffer overflow either. If you're in this kind of business you take responsibility by discovering and fixing bugs which would go unnoticed otherwise. And if the life of your patients really depend on your equipment then having a redundant component within your device is a must.
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