The kernel in Cisco NX-OS 5.2(9)N1(1) on Nexus 5000 devices allows local users to cause a denial of service (device crash) via crafted USB parameters, aka Bug ID CSCus89408.
http://www.securitytracker.com/id/1034295
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-nexus