Multiple use-after-free vulnerabilities in the ServiceWorkerScriptCacheMap implementation in content/browser/service_worker/service_worker_script_cache_map.cc in Google Chrome before 41.0.2272.76 allow remote attackers to cause a denial of service or possibly have unspecified other impact via vectors that trigger a ServiceWorkerContextWrapper::DeleteAndStartOver call, related to the NotifyStartedCaching and NotifyFinishedCaching functions.