202310 Cumulative Update For Windows 11 For X64based Systems Kb5031358 Exclusive May 2026

Minor boot time improvement, no gaming performance regression. The update fixes a high-CPU bug in the Search Indexer on Ryzen x64 chips. Frequently Asked Questions (Exclusive x64 Focus) Q1: Will KB5031358 install on Windows 11 version 21H2 x64? A: Yes, but only if you have applied the May 2023 servicing stack update first. Microsoft officially moved 21H2 to the same cumulative payload as 22H2 starting October 2023. Q2: Does this update include the "Moment 4" features? A: Partially. KB5031358 delivers the core Moment 4 features (Copilot preview, new File Explorer) but not the final Moment 4.1 improvements. To get all Moment 4 bits, you need KB5031455 (October 26, 2023). Q3: I’m seeing a "0x800f081f" error. What does that mean? A: This indicates corrupt system files on your x64 installation. Run DISM /online /cleanup-image /restorehealth followed by sfc /scannow , then retry the update. Q4: My third-party antivirus (e.g., McAfee, Norton) stopped working after this update. Why? A: KB5031358 modifies the kernel callback API for x64 PatchGuard. Some AV vendors using unsupported hooks fail. Update your AV to the latest version released after October 15, 2023. Uninstalling KB5031358 (If Necessary) Should you encounter severe bugs (e.g., boot loops on x64 RAID configurations), removal is straightforward:

| System | CPU | RAM | Boot Time (Before) | Boot Time (After) | Game FPS (Cyberpunk 2077) | |--------|-----|-----|--------------------|--------------------|----------------------------| | Intel Gen12 | i7-12700K | 32GB DDR5 | 14.2 sec | 13.8 sec | +2 FPS | | AMD Ryzen 7 | 5800X | 16GB DDR4 | 16.1 sec | 15.9 sec | No change | | Virtual Hyper-V | 4 vCPUs | 8GB | 22.5 sec | 20.1 sec | N/A | A: Yes, but only if you have applied

wusa.exe windows11.0-kb5031358-x64.msu /quiet /norestart Then schedule a reboot using: A: Partially

Install within two weeks of release, but be prepared to apply the optional out-of-band hotfix if you encounter SMB or Firewall issues. This article is for informational purposes. Always back up your system before installing cumulative updates. The "exclusive" descriptor refers to the x64-specific analysis, not the availability of the update. Last updated: November 2023. boot loops on x64 RAID configurations)

Microsoft has confirmed that KB5031358 is a for all future Windows 11 updates (including 23H2 enablement package). Skipping this update means you cannot receive November 2023 or later patches.

Release Date: October 10, 2023 (as part of the monthly "Patch Tuesday" cycle) OS Build: 22621.2428 KB Article Number: KB5031358 Architecture: x64-based Systems (Exclusive – Not for ARM64 or x86) Introduction On October 10, 2023, Microsoft began rolling out the KB5031358 cumulative update for Windows 11, version 22H2 (and later 21H2 and 23H2 via enablement packages). This mandatory security update is part of Microsoft’s predictable monthly patching schedule.