Multiple race conditions in the Web Audio implementation in Blink, as used in Google Chrome before 30.0.1599.66, allow remote attackers to cause a denial of service or possibly have unspecified other impact via vectors related to threading in core/html/HTMLMediaElement.cpp, core/platform/audio/AudioDSPKernelProcessor.cpp, core/platform/audio/HRTFElevation.cpp, and modules/webaudio/ConvolverNode.cpp.