On Sáb, 2015-05-09 at 23:30 +1000, Adrian wrote:

Does anyone have Virtualbox working
on FC22 ?

yes now we got  on rpmfusion : 

VirtualBox-4.3.26-3.fc22.x86_64.rpm

* Mon May 04 2015 Sérgio Basto <sergio@serjux.com> - 4.3.26-3
- Added diff_smap_4.patch from https://www.virtualbox.org/ticket/13961 ,
  may fix problems for kernel >= 3.19 , I still need disable 3D to run
plasma 5

( https://forums.virtualbox.org/viewtopic.php?f=6&t=64452&start=15#p320557 )