June Patch Tuesday update is out with fixes for Spectre variant 4, brightness controls issues

Microsoft is releasing today the June Patch Tuesday updates for all supported versions of Windows 10, and if you have already received the April 2018 update you should be seeing the build 17134.112 (KB4284835) in Windows Update today. This new cumulative update brings a mitigation for the Spectre variant 4, which was jointly disclosed by Microsoft, Google and Intel last month.

Intel previously said that it was working with PC OEMs to push a combination of microcode and software updates, adding that the mitigation would be turned off by default. Microsoft is following the same book today, and the company provided IT pros some instructions to enable the mitigations.

This latest cumulative update also comes with other quality improvements, including a fix for an issue that caused PC to boot to a black screen. If you've also had problems with brightness controls on your laptop, Microsoft says that this issue should be fixed in this build. The full release notes are available below:

  • Provides protections from an additional subclass of speculative execution side channel vulnerability known as Speculative Store Bypass (CVE-2018-3639). These protections aren't enabled by default. For Windows client (IT pro) guidance, follow the instructions in KB4073119. For Windows Server guidance, follow the instructions in KB4072698. Use this guidance document to enable mitigations for Speculative Store Bypass (CVE-2018-3639) in addition to the mitigations that have already been released for Spectre Variant 2 (CVE-2017-5715) and Meltdown (CVE-2017-5754).
  • Addresses an issue in which the 2017 and 2018 versions of Intuit QuickBooks can't run in multi-user mode on Windows 10 1803 devices. Users will now be offered Windows 10, version 1803.
  • Adds support for the SameSite cookie web standard to Microsoft Edge and Internet Explorer.
  • Addresses an issue with Internet Explorer that prevents it from using an updated version of location services.
  • Addresses an issue that causes certain games to fail to show dialogs when connected to monitors that support interlaced display formats.
  • Addresses an issue with the brightness controls on some laptops after updating to the Windows 10 April 2018 Update.
  • Addresses a reliability issue in which the GameBar may fail to launch.
  • Addresses an issue where firmware updates cause devices to go into BitLocker recovery mode when BitLocker is enabled, but Secure Boot is disabled or not present. This update prevents firmware installation on devices in this state. Administrators can install firmware updates by:
    1. Temporarily suspending BitLocker.
    2. Immediately installing firmware updates before the next OS startup.
    3. Immediately restarting the device so that BitLocker doesn’t remain in the suspended state.
  • Addresses an issue that caused the system to start up to a black screen. This issue occurs because previous updates to the Spring Creators Update were incompatible with specific versions of PC tune-up utilities after installation.
  • Security updates to Internet Explorer, Microsoft Edge, Microsoft scripting engine, Windows Desktop Bridge, Windows apps, Windows shell, Windows kernel, Windows Server, Windows storage and filesystems, Windows wireless networking, remote code execution, and Windows virtualization and kernel.

Microsoft also mentioned a known issue with the SMBv1 protocol that may prevent some users from accessing files or running programs from a shared folder. If you still rely on the decades-old protocol, the company says that a fix will be available later in June.

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