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The security of Android depends on the timely delivery of updates to fix critical vulnerabilities. In this paper we map the complex network of players in the Android ecosystem who must collaborate to provide updates, and determine that inaction by some manufacturers and network operators means many handsets are vulnerable to critical vulnerabilities. We define the FUM security metric to rank the performance of device manufacturers and network operators, based on their provision of updates anddoi:10.1145/2808117.2808118 dblp:conf/ccs/ThomasBR15 fatcat:2oddf6356jd2piwc4w52jcgz6m