A program tried to load new system extension(s) signed by “Kirill Luzanov”. If you want to enable these extensions, open Security & Privacy System Preferences.
I’ve found “Kirill Luzanov” on FaceBook (look like a truck driver!) and GitHub https://github.com/luzanovko.
Unfortunately, many of Apple’s ‘warnings’ are a bit short of useful info. I declined to ‘allow’ "Kirill Luzanov” or his ‘program’ to load/install any “system extensions”. Thank you very much! But it would be nice to know who/what/why the dialog displayed after the Safari and “Hardware(?)” update today.