# lsusb | grep -i sandisk
Bus 002 Device 002: ID 0781:5583 SanDisk Corp. Ultra Fit

# chmod 666 /dev/bus/usb/002/002

# ls -al /dev/bus/usb/002/
total 0
drwxr-xr-x 2 root root       80 Apr 21 16:17 .
drwxr-xr-x 4 root root       80 Apr 21 13:56 ..
crw-rw-r-- 1 root root 189, 128 Apr 21 14:48 001
crw-rw-rw- 1 root root 189, 129 Apr 21 16:32 002

add the qemu options: -usb -device usb-host,hostbus=2,hostport=2