Microsoft Confirms Windows 11 KB5127648 Update Can Block Users From Turning On Smart App Control

Microsoft has confirmed that the October KB5127648 security update for Windows 11 can prevent some users from turning on Smart App Control, according to an update to the official KB5127648 support document. On affected devices running Windows 11 version 24H2 and later, the Smart App Control option in the Windows Security app is grayed out and cannot be toggled. A permanent fix is not available yet.