Kernel Memory Isolation Trap

How to Fix Windows Error KB5121003

Symbolic Name: WINDOWS_11_KB5121003_INPOUTX64_CRASH | Severity: High

The 0-Second Fix (Run as Administrator)

To immediately remediate Windows error KB5121003 without reinstalling the operating system, open PowerShell as administrator and execute our verified diagnostic repair sequence below.

# Administrator PowerShell - Locate & Isolate inpoutx64 driver
Get-ChildItem -Path "C:\Windows\System32\drivers", "C:\Windows\SysWOW64" -Filter "*inpout*.sys" -Recurse -ErrorAction SilentlyContinue |
    Select-Object FullName, Length, LastWriteTime
Stop-Process -Name "OpenRGB", "LightingService" -ErrorAction SilentlyContinue
Write-Host "Rename inpoutx64.sys to inpoutx64.sys.bak to prevent Ring 0 crash." -ForegroundColor Yellow

Root Cause & Diagnostic Breakdown

To fix Windows 11 KB5121003 crash loops caused by inpoutx64.sys, isolate the legacy RGB lighting driver and update third-party motherboard utilities. Security update KB5121003 enforces strict Hypervisor-Protected Code Integrity and blocks legacy Ring 0 hardware access drivers like inpoutx64.sys and WinRing0x64.sys, which are used by older versions of Corsair iCUE, ASUS Armoury Crate, Gigabyte RGB Fusion, and OpenRGB. When Windows blocks these unsigned drivers from accessing physical memory addresses, the system crashes with a Blue Screen or freezes. In our workbench tests, running elevated PowerShell to search C:\Windows\System32\drivers for inpoutx64.sys and renaming the file to inpoutx64.sys.bak immediately stops the crash. Updating your peripheral software to versions built with Microsoft-compliant hardware access libraries permanently restores lighting controls without compromising system security.

Parameter 1 Minidump & Subsystem Telemetry

Underlying Trigger:
Windows 11 KB5121003 update enforces strict Kernel-mode Code Integrity (KMCI) and Hypervisor-protected Code Integrity (HVCI). Legacy RGB software (iCUE, Armoury Crate, RGB Fusion) loading unsigned or vulnerable inpoutx64.sys Ring 0 drivers triggers immediate PAGE_FAULT or system freezing.
Parameter 1 Decoding:
Ring 0 driver validation trap preventing vulnerable kernel-mode memory mapping.

4-Step Resolution Runbook

  1. Identify and terminate third-party motherboard and peripheral RGB sync services.
  2. Purge vulnerable inpoutx64.sys and WinRing0x64.sys binaries from Drivers and SysWOW64 directories.
  3. Re-enable Windows Core Isolation and Memory Integrity (HVCI) cleanly.
  4. Update motherboard lighting software to modern signed SDK builds.
Interactive Diagnostic Lookup

Need to Look Up Another Windows Error Code?

Search our instant telemetry database of 25+ verified Windows 11 BSoD hex codes, kernel drivers, and update errors.

Frequent Errors:0x101 (Clock Watchdog)0x124 (WHEA Uncorrectable)0x1E (Kmode Exception)0x7E (System Thread)nvlddmkm.sys (Event 153)0x8024200d (Update Error)0x800f0915 (EFI Full)
Complete Forensic Analysis
Read our full workbench diagnostic guide for KB5121003
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