Array index error in the MidiManagerUsb::DispatchSendMidiData function in media/midi/midi_manager_usb.cc in Google Chrome before 41.0.2272.76 allows remote attackers to cause a denial of service or possibly have unspecified other impact by leveraging renderer access to provide an invalid port index that triggers an out-of-bounds write operation, a different vulnerability than CVE-2015-1212.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.