Cisco Unified Computing System (UCS) B Blade Server Software 2.2.x before 2.2.6 allows local users to cause a denial of service (host OS or BMC hang) by sending crafted packets over the Inter-IC (I2C) bus, aka Bug ID CSCuq77241.
http://www.securitytracker.com/id/1033752
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151006-ucs