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Microsoft Releases Patch for Windows 11 Mouse Stutter Bug

Microsoft Releases Patch for Windows 11 Mouse Stutter Bug

First seen 14 Oct 2026, 23:34 UTC • •
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ThreatCluster AI
ThreatCluster •October 15, 2026 at 00:36 UTC
  • •Microsoft's update KB5127648 fixes mouse input stuttering in Windows 11 games.
  • •The update addresses over 1,400 security vulnerabilities, including two high-severity CVEs.
  • •Users are encouraged to install the update to resolve gaming-related mouse issues.

On October 13, 2026, Microsoft released security update KB5127648 for Windows 11, addressing a bug that caused mouse input stuttering in some games. This update applies to Windows 11 versions 24H2, 25H2, and 26H2. Although Microsoft confirmed the bug, it did not specify which games were affected or the root cause. The update also included fixes for over 1,400 security vulnerabilities, including two high-severity CVEs: CVE-2026-96951 and CVE-2026-108398, both published on the same day. Users experiencing mouse stutter while gaming are advised to install this update. The update is particularly important as it marks the end of support for Windows 11 24H2 and Pro editions. Microsoft has not confirmed whether specific reports of mouse stutter are linked to this bug.

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Timeline

2026-10-13
Microsoft releases update KB5127648
The update fixes mouse input stuttering in games and addresses over 1,400 security vulnerabilities.
Finance.Biggo
2026-10-13
CVE-2026-96951 published
A Windows Shell vulnerability that bypasses Mark of the Web protections was disclosed and actively exploited.
Finance.Biggo
2026-10-13
CVE-2026-108398 published
A vulnerability affecting the .NET Framework was disclosed but has not been observed in active exploitation.
Finance.Biggo

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Common questions

Which Windows 11 versions are affected?
The update applies to Windows 11 versions 24H2, 25H2, and 26H2.
What should I do if I experience mouse stuttering?
Install the KB5127648 update to resolve the mouse input stuttering issue.
Are there any critical vulnerabilities in this update?
Yes, the update addresses two high-severity vulnerabilities, CVE-2026-96951 and CVE-2026-108398.