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Microsoft has no permanent fix yet for the Smart App Control bug in update KB5127648. Until then, here’s how to get it working.
However, after installing the October 2026 update, the option to activate Smart App Control is suddenly grayed out for some users.
According to Microsoft, only PCs on which Smart App Control was already disabled are affected. Users who already had the feature enabled remain protected by the feature—it’s not automatically disabled, but it also cannot be re-enabled if you end up disabling it.
Microsoft has released a temporary workaround that involves modifying two values in the Windows Registry.
