Some games may freeze or close unexpectedly
On some PCs, inpoutx64-family drivers installed by RGB-lighting peripherals or internal components are associated with game freezes, unexpected exits, errors or restarts.
Microsoft · Windows 11 security update
KB5121003 — is it safe to install?
Windows 11 24H2/25H2 KB5121003 · 2026-08-11
Caution88/100
Check your gaming setup before installing
It is a security update with clear value, but Microsoft is investigating game crashes and unexpected restarts on some PCs with specific RGB-lighting related drivers.
QUICK ANSWER
KB5121003 · Check your gaming setup before installing
It is a security update with clear value, but Microsoft is investigating game crashes and unexpected restarts on some PCs with specific RGB-lighting related drivers.
Officially confirmed issues
Windows 11 24H2/25H2 security update
Microsoft released this cumulative security update on August 11, 2026 for OS Builds 26200.9168 and 26100.9168.
Community-reported issues
Community-reported issues · general
1 signals · 1 sources
Community-reported issues · boot
1 signals · 1 sources
Public Reddit/forum/support-community reports are grouped as early-warning signals and kept separate from official issues.
Before you install
Before installing
If you play ARC Raiders, MARVEL Tōkon: Fighting Souls or THE FINALS, or use RGB-lighting control software, check Microsoft's investigation status first.
If you are affected
Back up important files and avoid repeated forced reinstalls. Check Windows recovery options and updated drivers from the peripheral vendor first.
User reports
Field reports 0 · stable installs not enough data · confidence 낮음
Did you install this update?
Your result helps build Updatehey’s independent field dataset.
Related searches
KB5121003 issues safe to install Windows 11 24H2 25H2 game crash restart RGB inpoutx64 ARC Raiders THE FINALS
Related recovery guides
Pause Windows updates · Uninstall a problematic update · Repair Windows Update
Evidence freshness
Official evidence has been checked recently by the automated source monitor.
Frequently asked questions
Is KB5121003 safe to install?
Check your gaming setup before installing. It is a security update with clear value, but Microsoft is investigating game crashes and unexpected restarts on some PCs with specific RGB-lighting related drivers.
Are there known issues with KB5121003?
Some games may freeze or close unexpectedly. On some PCs, inpoutx64-family drivers installed by RGB-lighting peripherals or internal components are associated with game freezes, unexpected exits, errors or restarts.
What should I do before or after installing KB5121003?
Before installing. If you play ARC Raiders, MARVEL Tōkon: Fighting Souls or THE FINALS, or use RGB-lighting control software, check Microsoft's investigation status first.
Related updates
Evidence timeline
Recent official-document changes and community signals linked to this update. Official and unofficial evidence remain separated.
Official source changes
- 2026-08-29 00:17:24 · Windows 11 24H2 릴리스 상태
추가 1개 · 삭제 1개 문장/블록 · View original - 2026-08-29 00:17:24 · Windows 11 24H2 해결된 문제
추가 1개 · 삭제 1개 문장/블록 · View original - 2026-08-27 16:26:05 · Windows 11 24H2 릴리스 상태 · View original
- 2026-08-27 16:26:05 · Windows 11 24H2 해결된 문제 · View original
Community first-seen signals
- 2026-08-29 00:17:24 · Microsoft Q&A · Windows 11 KB5121003 Installation and Boot Failure Issue
- 2026-08-28 08:17:14 · ElevenForum · KB5121003 Windows 11 Cumulative Update build 26100.9168 (24H2) and 26200.9168 (25H2) - Aug. 11
Update information changes as vendors publish new evidence. Back up important systems before installing.