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2mo ago

Microsoft Confirms Windows Update Bugs That Break Mouse Cursors and Trigger False Defender Alerts

Microsoft has deployed a targeted driver block and says broader fixes will arrive with the September security updates to stop the issues.

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Geöffneter Laptop auf einem Tisch vor einer Zimmerpflanze. Auf dem Bildschirm ist ein blaues Hintergrundmotiv von Windows 11 mit einem weißen Schildsymbol zu sehen. Im Vordergrund liegen zwei Hände auf der Tastatur und dem Touchpad. Die Umgebung ist hell beleuchtet, mit unscharfem Hintergrund. Die nur teils abgebildete Person am Laptop trägt ein gelbes Oberbekleidungsstück, wie am rechten Bildrand zu sehen ist.
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Overview

  • Microsoft confirmed on August 31 that optional preview update KB5120998 and later preview builds have been linked to resets of custom mouse‑cursor settings and to desktop backgrounds being replaced or removed.
  • A separate Defender update from early August can produce repeated “Microsoft Defender is turned off” notifications even though real‑time protection remains enabled and the messages are false alarms.
  • Microsoft has already implemented a targeted mitigation that blocks the inpoutx64 RGB driver when the game ARC Raiders is installed and says it will distribute a wider driver block with the September Patch Tuesday updates.
  • Affected users are asked to report symptoms through the Feedback Hub, can uninstall or delay the optional KB5120998 preview update as a practical workaround, and should verify Defender’s real‑time protection in Settings if they see warnings.
  • Many Windows installations report no problems, but because preview updates expose compatibility issues on some machines Microsoft warns users to avoid installing optional previews until fixes arrive and plans to issue repairs in the coming days.