Microsoft fixed an issue in its Hyper-V hypervisor that, if exploited, could have resulted in a denial-of-service condition.
The issue exists on the hardware level in certain chip sets, but users who run Hyper-V on Windows Server 2008, Windows Server 2008 R2, Professional and Enterprise versions of Windows 8 and Windows 8.1, Windows Server 2012, Windows Server 2012 R2, and all x64-based versions of Windows 10 except Home edition were at risk, Microsoft said in its advisory (3108638). Customers running Windows Server Technical Preview 3 are also affected. Microsoft rated the two vulnerabilities (CVE-2015-5307 and CVE-2015-8104) as Important and released the patch addressing them alongside the regular update cycle this week.
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