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First, I'd suggest you to remove buildsys-build-rpmfusion-kerneldevpkgs-current package if you are unsure if you need it. You should actually don't need it unless you are really using it, which seems to be very unlikely.

yum remove buildsys-build-rpmfusion-kerneldevpkgs-current

And about kmod-VirtualBox package, as @hello said, rpmfusion kmod packages usually are a little behind the latest kernel in Fedora. I'd suggest you to install akmod-VirtualBox instead so that modules will be build for your running kernel. So, I'd suggest:

yum install akmod-VirtualBox
yum remove kmod-VirtualBox-3.15.9-200.fc20.x86_64-4.3.14-1.fc20.4.x86_64

First, I'd suggest you to remove buildsys-build-rpmfusion-kerneldevpkgs-current package if you are unsure if you need it. You should actually don't need it unless you are really using it, which seems to be very unlikely.

yum remove buildsys-build-rpmfusion-kerneldevpkgs-current

And about kmod-VirtualBox package, as @hello said, rpmfusion kmod packages usually are a little behind the latest kernel in Fedora. I'd suggest you to install akmod-VirtualBox instead so that modules will be build for your running kernel. So, I'd suggest:

yum remove "kmod-VirtualBox*"
yum install akmod-VirtualBox
yum remove kmod-VirtualBox-3.15.9-200.fc20.x86_64-4.3.14-1.fc20.4.x86_64