[nikanj]

Big Sur doesn't even support kernel extensions, so this sounds unlikely.

[klik99]

Quick google shows that subset of kexts still allowed. I updated to Big Sur last week and installed kernel extensions for exactly this reason.

[user-the-name]

You might be confusing this with the fact that Big Sur, on Apple Silicon, does not support x86 kernel extensions. It still supports them elsewhere, and it supports arm64 kernel extensions on Apple Silicon.