Microsoft pushes Windows 8.1 KB4516064 and KB4516067 to users

While Windows 8.1 has a much smaller user base compared to Windows 7 or Windows 10, Microsoft continues to push new cumulative updates regularly to users.

As usual, September Patch Tuesday brought one security update (KB4516064) and one monthly rollup update (KB4516067) to Windows 8.1 users.

Both these patches feature the exact same changelog. At the same time, they also share one common issues.

For more information, you can check out the official changelog below:

• Provides protections against a new subclass of speculative execution side-channel vulnerabilities, known as Microarchitectural Data Sampling, for 32-Bit (x86) versions of Windows (CVE-2019-11091, CVE-2018-12126, CVE-2018-12127, CVE-2018-12130). Use the registry settings as described in the Windows Client and Windows Server articles. (These registry settings are enabled by default for Windows Client OS editions and Windows Server OS editions.)
• Security updates to Windows App Platform and Frameworks, Windows Kernel, Windows Input and Composition, Windows Media, Windows Fundamentals, Windows Authentication, Windows Datacenter Networking, Windows Storage and Filesystems, the Microsoft JET Database Engine, and Windows Server.

As far as the bug is concerned, Microsoft warns users that certain operations performed on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5).

If you still want to download these two updates, follow the link below:

• Download KB4516064 [Direct download link]

• Download KB4516067 [Direct download link]