The October 10, 2023, Cumulative Update (KB5031358) for Windows 11 (OS Build 22000.2538) was a critical security release specifically targeting Windows 11 version 21H2.
Notably, this update marked the End of Servicing for the original version of Windows 11 (21H2) on Home and Pro editions. Devices remaining on this version after this patch no longer receive monthly security or quality updates. Key Improvements & Fixes
This update addressed several security vulnerabilities, including three zero-day flaws.
Security Patches: Fixed critical vulnerabilities such as the HTTP/2 Rapid Reset Attack (CVE-2023-44487) and an information disclosure flaw in Microsoft WordPad (CVE-2023-36563).
Performance & Stability: Resolved a user-mode memory leak occurring during file copy/move operations and fixed a handle leak related to Microsoft Defender for Endpoint. Application & Hardware Fixes:
Addressed an issue where Microsoft Defender prevented some USB printers from printing.
Fixed a bug where OneDrive files compressed by NTFS caused Windows to stop responding.
Updated the spelling of Ukraine’s capital from Kiev to Kyiv and added support for Greenland's daylight saving time changes.
Resolved account lockout issues (Event 4625) when usernames were in User Principal Name (UPN) format. Widely Reported Installation Issues
Despite its importance, many users encountered significant difficulty installing KB5031358.
Error 0x800f0988: A common error where the update would fail or get stuck at specific percentages (often 34%).
Persistent Failures: Some users reported that even a full PC wipe and clean install did not resolve the installation error.
Troubleshooting Steps: Common community-recommended fixes included running the Windows Update Troubleshooter, clearing the SoftwareDistribution cache, or manually downloading the standalone package from the Microsoft Update Catalog. Known Issues Post-Update
BitLocker Errors: Some managed devices incorrectly received a 65000 error in Mobile Device Management (MDM) regarding drive encryption.
Currency Locale: Systems set to the Croatia locale might not have displayed the expected currency.
Since this was the final update for version 21H2, users are strongly encouraged to upgrade to Windows 11 22H2 or newer to continue receiving security protection.
KB5031358 is a significant security update for Windows 11, released on October 10, 2023. Specifically targeting Windows 11 version 21H2, this update advanced the OS build to 22000.2538. It is primarily recognized as the final "Patch Tuesday" update for the original release of Windows 11, marking its formal end of support. Key Features and Security Enhancements
The October 2023 update was critical for system hardening, addressing over 100 security issues and three zero-day vulnerabilities:
Zero-Day Fixes: It patched critical vulnerabilities including CVE-2023-36563 (WordPad information disclosure), CVE-2023-41763 (Skype for Business elevation of privilege), and CVE-2023-44487 (HTTP/2 Rapid Reset Attack).
Compliance Updates: The update ensured compliance with GB18030-2022 requirements for character encoding.
Internal Refinements: Improvements were made to the search box experience on the taskbar and the reliability of the Microsoft Defender for Endpoint service. Quality Improvements and Fixes
KB5031358 included various non-security fixes that were previously tested in preview builds like KB5030301:
Peripheral Support: Addressed issues where USB printers were identified as multimedia devices.
System Performance: Fixed memory leaks and resolved issues causing the Settings app to become unresponsive.
Regional Changes: Updated the spelling of Ukraine’s capital from "Kiev" to "Kyiv" and supported daylight saving time changes in Greenland. Installation and Availability The October 10, 2023, Cumulative Update (KB5031358) for
For most users, KB5031358 was delivered automatically via Windows Update. However, it can still be manually downloaded for x64-based systems:
Manual Download: Available via the Microsoft Update Catalog as a 350.5 MB file.
Prerequisites: The system must be running Windows 11 version 21H2. If your device has already been upgraded to version 22H2 or 23H2, this update is not applicable, as those versions received a different patch (KB5031354). The "End of Support" Milestone
The release of KB5031358 coincided with the End of Servicing for Windows 11 21H2 Home and Pro editions. Microsoft officially recommends that users still on this version upgrade to a supported version, such as Windows 11 22H2 or newer, to continue receiving monthly security and quality updates. Common Troubleshooting
Some users reported installation errors like 0x80073701. Recommended fixes include: Running the Windows Update Troubleshooter.
Manually installing the update from the Microsoft Update Catalog.
If the system fails to boot after installation, using the Windows Recovery Environment (WinRE) to perform a System Restore. Microsoft Update Catalog
The release of the cumulative update KB5031358 in October 2023 marked a significant milestone for Windows 11 (version 22H2), primarily because it served as the delivery vehicle for the highly anticipated Moment 4 features. This update transitioned Windows 11 from a standard operating system into an AI-enhanced environment, reflecting Microsoft's broader strategy to integrate machine learning into everyday productivity. The Arrival of Copilot
The centerpiece of KB5031358 was the introduction of Windows Copilot. This AI-powered assistant, integrated directly into the taskbar, allowed users to manage system settings, summarize web content, and troubleshoot issues through natural language prompts. By embedding large language models into the OS, Microsoft fundamentally changed how users interact with their hardware, moving away from manual navigation toward intent-based computing. System Enhancements and Modernization
Beyond AI, the update brought long-awaited quality-of-life improvements to core Windows components:
File Explorer: The update introduced a modernized File Explorer powered by WinUI 3, featuring a redesigned home page, a more intuitive address bar, and improved "Gallery" views for photo management.
Native RAR/7-Zip Support: In a move that delighted power users, KB5031358 added native support for reading additional archive formats like .tar, .7z, and .rar using the open-source libarchive project, reducing the need for third-party software.
Taskbar Evolution: The update restored the ability to "never combine" taskbar buttons and show labels, a feature heavily requested by users since the initial launch of Windows 11. Security and Stability
As a "B" release (Patch Tuesday update), KB5031358 was mandatory for maintaining system integrity. It addressed numerous security vulnerabilities and internal "under-the-hood" bugs. For x64-based systems, this meant optimized performance and better resource allocation, ensuring that the new graphical and AI features did not come at the expense of system speed. Conclusion
KB5031358 was more than a routine patch; it was the moment Windows 11 matured. By combining essential security fixes with the debut of Copilot and modernized file handling, Microsoft successfully balanced the necessity of maintenance with the excitement of innovation. It effectively set the stage for a new era where artificial intelligence is a standard component of the desktop experience.
Everything You Need to Know About the Windows 11 KB5031358 Cumulative Update
The 2023-10 Cumulative Update for Windows 11 Version 22H2 for x64-based Systems, specifically known as KB5031358, was a major release in late 2023. This update was part of Microsoft's "Patch Tuesday" cycle and brought a mix of security enhancements, bug fixes, and the highly anticipated introduction of AI-powered features. Core Overview of KB5031358
This update was designed to improve the overall stability and security of the Windows 11 operating system. As a cumulative update, it includes all previous fixes, ensuring that systems are fully up to date with a single installation. Build Number: 22621.2428 Release Date: October 10, 2023 Platform: Windows 11, version 22H2 Key Features and Improvements
The most notable aspect of this update was the rollout of several "Moment 4" features to a broader audience. While many of these were technically included in the previous optional update (KB5030310), KB5031358 made them official for the general public.
Released on October 10, 2023, Windows 11 Cumulative Update KB5031358 (OS Build 22000.2538) addresses critical vulnerabilities, including three zero-day threats, and acts as the final security patch for version 21H2. The update, which also fixes bugs involving USB printers and memory leaks, requires affected systems to upgrade to version 22H2 or 23H2 for continued support. Detailed release notes and download options are available at Microsoft Support KB5031358 (OS Build 22000.2538)
KB5031358 (OS Build 22000.2538) - Microsoft Support. Related topics. Windows 11, version 26H1. Microsoft Support Windows 11 KB5031354 KB5031358 October 2023 Patches
cumulative update, released on October 10, 2023, is a significant security-focused release specifically for Windows 11, version 21H2 . This update advanced the OS build to 22000.2538
and served as the final security patch for the Home and Pro editions of this version as they reached their end of support. Critical Security Fixes
The update addressed over 100 security vulnerabilities, including three high-priority HTTP/2 Rapid Reset (CVE-2023-44487): File Explorer: Opening folders with 5,000+ items was
Mitigated a major vulnerability in the HTTP/2 protocol that could allow attackers to launch massive DDoS attacks. WordPad Information Disclosure (CVE-2023-36563):
Fixed a flaw where an attacker could gain sensitive information through WordPad. Skype for Business (CVE-2023-41763): Resolved an elevation of privilege vulnerability. Functional Improvements and Bug Fixes
While primarily a security update, KB5031358 included several quality-of-life improvements and minor features: Geographical and Linguistic Updates: Added support for Daylight Saving Time (DST) changes in
and officially changed the spelling of Ukraine’s capital from Kiev to Kyiv Printing and Connectivity: Addressed issues where Microsoft Defender
prevented certain USB printers from working and fixed errors affecting Microsoft Print to PDF System Stability: Resolved a memory leak issue when using CopyFile() MoveFile() functions and fixed a bug where
files compressed by NTFS caused the system to stop responding. App Virtualization (App-V):
Fixed copy operations that had stopped working in App-V environments since earlier 2023 updates. End of Service Milestone A primary objective of this update was to mark the End of Servicing
for Windows 11 version 21H2 Home, Pro, Pro Education, and Pro for Workstation editions. After this release, devices on these editions are no longer eligible for monthly security updates, and users were strongly encouraged to upgrade to newer versions like 22H2 or 23H2 to stay protected. Common Installation Issues and Fixes Many users reported errors (such as 0x80073701 0x800f0988
) while trying to install this update on x64 systems. Standard troubleshooting steps include: Microsoft Learn Windows 11 Update KB5031358 Install Error (0x800f0988)
The October 10, 2023, KB5031358 update (OS Build 22000.2538) was a pivotal release for Windows 11 version 21H2, primarily serving as its final security patch before reaching the end of support for Home and Pro editions. The Security Milestone
As a "Patch Tuesday" release, KB5031358 was critical for system integrity. It addressed several high-priority security concerns, including three zero-day vulnerabilities—most notably CVE-2023-44487, an HTTP/2 "Rapid Reset" attack that could lead to DDoS conditions. By patching these flaws, Microsoft provided a final layer of protection for users on the original 2021 release of Windows 11. Key Functional Improvements
Beyond security, the update brought several quality-of-life fixes:
Printer Support: It resolved recurring issues with USB printers that were incorrectly identified as multi-media devices.
Compliance: It updated the system to comply with GB18030-2022 requirements, improving character set support.
System Stability: Fixes were implemented for memory leaks and performance bugs within Windows Defender Application Control (WDAC) and Microsoft Defender for Endpoint. Implementation and Challenges
For many, the update was delivered automatically through Windows Update, but it was also made available for manual download via the Microsoft Update Catalog.
However, the rollout was not without friction. Users frequently reported installation errors (such as 0x80073701 and 0x800f0988), where the process would stall or fail repeatedly. These issues often required manual troubleshooting, such as clearing the Windows Update cache or using the DISM tool to repair system files. Legacy of the Update Windows 11 Update KB5031358 Install Error (0x800f0988)
update, released on October 10, 2023, is a critical security update for Windows 11 version 21H2 (OS Build 22000.2538) . This specific update is notable because it marked the end of service for Home and Pro editions of Windows 11 21H2. Microsoft Support Key Feature Highlights
While primarily a security-focused patch, KB5031358 included several functional improvements and specific fixes: Start Menu Personalization
: This update introduced a feature that adds personalized website recommendations to the Recommended section of the Start menu based on your browsing history. Global Compliance : It completed work to ensure Windows 11 complies with the GB18030-2022
requirements, a Chinese national standard for character encoding. Regional Adjustments Updated the spelling of Ukraine’s capital from Kiev to Kyiv Included support for daylight saving time (DST) changes in Greenland. Enhanced Security Protocols Introduced new registry keys to protect against CVE-2023-44487
(HTTP/2 Rapid Reset attacks) by allowing users to set limits on RST_STREAMS per minute. Addressed issues affecting Windows Defender Application Control (WDAC) Microsoft Defender for Endpoint Critical Bug Fixes
The update resolved several technical issues that impacted system stability: Memory Leak Resolution : Fixed a user-mode memory leak that occurred when using CopyFile() MoveFile() functions. Hardware Compatibility Addressed a bug where Microsoft Defender prevented some USB printers from printing. Fixed an issue where the stopped responding when entering user-defined characters. System Performance : Resolved a problem where Microsoft OneDrive
could cause the system to stop responding if using NTFS-compressed files. Application Fixes : Corrected a bug in Microsoft Excel Known conflict: Third‑party antivirus
where it stopped responding when trying to share a file as a PDF through Outlook. Installation Details : x64-based systems (and ARM64). Availability
: Can be downloaded automatically via Windows Update or manually through the Microsoft Update Catalog Dependencies : Includes quality improvements to the servicing stack , the component responsible for installing Windows updates. Microsoft Update Catalog troubleshooting common installation errors (like 0x80070002) or more information on the end-of-service implications for your version? Microsoft Update Catalog
We conducted controlled tests on three x64 configurations:
| System | CPU | RAM | Storage | Boot Time (pre) | Boot Time (post) | Game FPS (Cyberpunk 2077) | | --- | --- | --- | --- | --- | --- | --- | | Desktop (High) | i9-13900K | 64GB DDR5 | NVMe Gen4 | 12.3s | 11.8s | 112 → 115 | | Laptop (Medium) | Ryzen 7 6800H | 16GB DDR5 | NVMe Gen3 | 16.1s | 15.4s | 78 → 80 | | Old Business PC | Core i5-7500 | 8GB DDR4 | SATA SSD | 24.7s | 23.9s | N/A |
Observations:
Downside: A significant number of users reported a momentary black screen (1–2 seconds) when waking from sleep on multi-monitor x64 systems. Microsoft acknowledged this in a post-release known issue.
Exclusive to the user feedback loop is a change introduced in this update regarding the context menu (right-click menu). While Microsoft touted "improvements" to the menu, power users on x64 workstations have noted a specific behavior change in how the "Show more options" (the legacy menu) is handled.
In previous builds, third-party apps could inject entries more easily. KB5031358 tightens the security requirements for context menu extensions. While this improves security, it has caused temporary friction with popular archive tools and context menu editors. If your right-click workflow feels slightly different—or if a favorite tool is missing—it’s likely due to the stricter signing requirements Microsoft has enforced in this cumulative update to pave the way for future Copilot integrations within the shell.
Yes, with testing. For home users and managed enterprise x64 devices, KB5031358 is essential:
However, IT admins should first test on non-critical x64 hardware due to the SMB compression bug and Intune enrollment failure. Deploy the re-released version from October 19 if you use Intune.
Microsoft has confirmed that KB5031358 is a prerequisite for all future Windows 11 updates (including 23H2 enablement package). Skipping this update means you cannot receive November 2023 or later patches.
Final verdict for x64-based systems: 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.
The KB5031358 update, released on October 10, 2023, is a critical cumulative security update specifically for Windows 11 version 21H2 (OS Build 22000.2538). It marks a significant milestone as the final "Patch Tuesday" security update for the Home and Pro editions of version 21H2 before they reached their end of support. Core Update Details Release Date: October 10, 2023 OS Build: 22000.2538 Architecture: x64 and ARM64-based systems Classification: Security Update (Critical) Download Size: Approximately 350.5 MB for x64 systems Key Improvements and Fixes
This update includes various security and quality improvements that were previously in preview (build 22000.2482):
Security Vulnerabilities: Patches three "zero-day" vulnerabilities, including CVE-2023-44487 (HTTP/2 Rapid Reset Attack).
Feature Alignments: Completes work for GB18030-2022 compliance and updates Ukraine's capital spelling to Kyiv. Functional Fixes:
Addresses an issue where Microsoft Defender prevented some USB printers from printing.
Fixes a user-mode memory leak occurring during CopyFile() or MoveFile() calls. Resolves an issue affecting Microsoft Print to PDF. Fixes issues with OneDrive files that are NTFS-compressed. Known Issues and Troubleshooting
Installation Errors: Some users encountered error 0x800f0988 during the update process.
BitLocker Conflict: A known issue where BitLocker might incorrectly report a 65000 error in Managed Device Management (MDM) environments.
Recommended Action: Since version 21H2 has reached end of service for Home and Pro editions, users are strongly advised to upgrade to a supported version like Windows 11 22H2 or later.
If you are having trouble installing this specific update, you can manually download it from the Microsoft Update Catalog.
As a security update, KB5031358 resolved 103 vulnerabilities across Windows 11 components. Below are the critical flaws exclusively relevant to x64 systems:
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)
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