After KB3074665 update, second hotfix update KB3074674 aka Cumulative Security update for Windows 10: July 21, 2015′ has been released to insiders on Windows 10 build 10240 and is available to download via Windows Update. When you check for updates, you can notice ‘Synaptics driver update for Synaptics SMBus Driver’ has been also offered to install.

According to KB3074674 page, this security update ” resolves a vulnerability in Windows that could allow elevation of privilege if the Windows Installer service incorrectly runs custom action scripts.”

KB3074674 update

“Additionally, this update includes non-security-related changes to enhance the functionality of Windows 10 through new features and improvements. “

To install this update, you need to restart your computer.

Have you found build 10240 more stable or buggy?