I installed some software that I wanted to quickly check out. As it turns out, it helpfully decided to install a couple of Extensions. These extensions were for hardware I don’t have, nor do I plan to get.

I didn’t allow them in System Preferences > Security & Privacy, but there they were, still on my drive in  the /Library/StageExtensions folder.

This folder is protected by SIP, so I wasn’t able to simply delete them.

Fortunately, running the following in Terminal cleared out the folder:

sudo kextcache --clear-staging

I also invalidated the kextcache on my boot driver via:

sudo kextcache -invalidate /

Now the offending extensions are gone, hopefully never to return.