Unfortunately no luck when upgrading to libusb-1_0-0-1.0.27-lp155.74.1.x86_64
The system is absolutely trashed with
> mrt 02 19:54:32 vmhost kernel: usb 1-3: usbfs: process 1664 (qemu-system-x86) did not claim interface 1 before use
(40-50 entries per second).
In advance I did a full zypper update to get the latest, but I didn't check if
you had kernel updates or libvirt/qemu updates in your repo.