Microsoft is warning users that some manually made Windows 11 installer media could contain a bug where new PC installs may not get future security updates. It affects USB and CD installers made with October and November release patches, which may be relevant to professional users who set up PCs within business or education environments, or enthusiasts who recently built their own PCs.

This does not affect PCs that received the October or November patches through Windows Update or the Microsoft Update Catalog website.

Mitigating the problem will require you to rebuild your Windows 11 media installers with the December 2024 patch update included (released on December 10th) and reinstall Windows. (To avoid it altogether, Microsoft suggests that “that media used to install Windows 11, version 24H2, includes the December 2024 monthly security update.”) Microsoft says it’s working on a permanent fix.

Bleeping Computer reported that Windows 11 24H2 also had other bugs in tow, including problems with specific audio devices, issues launching Outlook with an outdated Google Workspace Sync, and others. There was also that weird 24H2 compatibility issue with some Ubisoft games, which are slowly receiving fixes.