I have installed CUDA Toolkit, which comes with its own Nvidia drivers etc. However, since the Nvidia drivers and tools from rpmfusion-nonfree-updates are slightly newer, Fedora tries to install those instead, which fails due to conflicts.
How can I prevent Fedora from trying to overwrite packages from the cuda-fedora42 repo with similar packages from rpmfusion-nonfree-updates? I would prefer not having to lock the package version, as I want updates when available in the cuda repo. I would also prefer to not remove rpmfusion-nonfree-updates entirely, since I get Discord and some other packages from there too.

Ah, interesting… I’ve been using CUDA Toolkit/SDK since Fedora 39 I think, and I was under the impression that it required its own versions of the drivers. I tried removing all packages from cuda-fedora42, reinstalling the driver from rpmfusion and then just the cuda-toolkit. So far it seems to be working, so let’s hope it continues that way. Thanks!
No prob. To help in the future, think of it like this:
So the only time you get a mismatch and have a problem is when you have an OLD driver paired with a new library. This is because the library may try to issue a new command that the driver does not yet support.
If you ever run into issues, just search up the Nvidia version support matrix for whichever library is having problems. Here is an example