Resolva um host apenas se criar erro com o vagrant

No meu macbook vagrant + virtualBox recém-instalado, recebi este erro no primeiro vagrant up:

Bringing machine 'default' up with 'virtualbox' provider...
[default] Importing base box 'Cupcake'...
[default] Matching MAC address for NAT networking...
[default] Setting the name of the VM...
[default] Clearing any previously set forwarded ports...
[default] Creating shared folders metadata...
[default] Clearing any previously set network interfaces...
There was an error while executing `VBoxManage`, a CLI used by Vagrant
for controlling VirtualBox. The command and stderr is shown below.

Command: ["hostonlyif", "create"]

Stderr: 0%...
Progress state: NS_ERROR_FAILURE
VBoxManage: error: Failed to create the host-only adapter
VBoxManage: error: VBoxNetAdpCtl: Error while adding new interface: failed to open /dev/vboxnetctl: No such file or directory

VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component HostNetworkInterface, interface IHostNetworkInterface
VBoxManage: error: Context: "int handleCreate(HandlerArg*, int, int*)" at line 68 of file VBoxManageHostonly.cpp

A solução é bastante fácil:

OSX

sudo /Library/StartupItems/VirtualBox/VirtualBox restart

Linux

sudo modprobe vboxnetadp