To be clear, the FIs are vulnerable only under certain circumstances:
"Cisco UCS Fabric Interconnects are affected only when NetFlow monitoring is enabled on the device and a flow exporter profile is configured with a source IP address set for the exporter interface"
The workaround for FIs, would be to turn off netflow, until fixed code comes out (which will be this month):
UCS 6200 and 6300 Series Fabric Interconnects:
Kirk...