I am seeing the same thing on 13.10:

root@compute01:/dev/bus/usb# cat /root/nexus4.xml 
    <hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
        <vendor id='0x18d1'/>
        <product id='0x4ee0'/>
      </source>
    </hostdev>

root@compute01:/dev/bus/usb# virsh attach-device lava-worker-2 /root/nexus4.xml 
error: Failed to attach device from /root/nexus4.xml
error: Path '/dev/bus/usb/000/000' is not accessible: No such file or directory

root@compute01:/dev/bus/usb# libvirtd --version
libvirtd (libvirt) 1.1.1

the only way I've been able to get this to work is:

mkdir /dev/bus/usb/000/000
ln -s /dev/bus/usb/001/008 /dev/bus/usb/000

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https://bugs.launchpad.net/bugs/1264465

Title:
  hotplugging USB device by vendor/product fails: Path
  '/dev/bus/usb/000/000' is not accessible

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