I have encountered a number of issues regarding virtualbox on hardened profiles. I'm going to be opening each as a separate atomic bug and keep track of them all with this tracker. As a summary: virtualbox 3.1.8 has only one minor issue, but other than that works. Moving to the recently stabilized 3.2.12 introduced at least two serious issues and possibly more.
Like I wrote in other hardened-related bugs, feel free to add any changes being necessary to get these hardened problems sorted out.
Only this tracker is open for the last 2 years, maybe we can close it? A tracker which is tracking nothing seems solved to me.