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Change in USB Handling for KVM betweeen kernels 4.9.0-5 and 4.14.0-2 ?

I have a QEMU/KVM virtual machine on which I linked a USB device.

I use testing, however with the 4.14.0-2 of testing, the VM does not
start because it cannot access the USB device. Running the same testing
userland, but with kernel 4.9.0-5 from stable, everything works. What
could be the reason, which setting should I change ?