Comment 21 for bug 814323

Solution provided in upstream.

Attaching fixing patch:

sudo -i
service vboxdrv stop
wget -O /tmp/vboxhost-fix-panic.patch http:/launchpad.net/..../vboxhost-fix-panic.patch
cd /usr/share/virtualbox/src/vboxhost
patch -p1 < /tmp/vboxhost-fix-panic.patch
dkms remove -m vboxhost -v 4.1.0 --all
dkms add -m vboxhost -v 4.1.0
dkms build -m vboxhost -v 4.1.0
dkms install -m vboxhost -v 4.1.0
service vboxdrv start