hotpatch updates Archives

Winsage

February 11, 2026

Microsoft rolls out Windows 11 26H1, but you can’t have it

Microsoft has released Windows 11 26H1, which is specifically designed for devices with Qualcomm Snapdragon X2 hardware and is not intended for most users. This version will not be available as an in-place update, will not have a successor (26H2), and will not support hotpatch updates. IT administrators are advised to use Windows 11 versions 24H2 and 25H2 for enterprise deployment. The release marks the retirement of the .NET Framework 3.5 as a Windows Feature on Demand optional component, effective with Windows 11 version 26H1. Support for .NET Framework 3.5 will end on January 9, 2029, prompting developers to prioritize migration efforts. Only devices with Snapdragon X2 hardware running Windows 11 26H1 will be affected by this change.

Winsage

December 11, 2025

Windows Defender Firewall Service Vulnerability Let Attackers Disclose Sensitive Data

A vulnerability in the Windows Defender Firewall Service, designated as CVE-2025-62468, was disclosed on December 9, 2025, and has an Important severity rating. It results from an out-of-bounds read condition, allowing an authorized attacker with elevated privileges to access sensitive heap memory without user interaction. The vulnerability has a CVSS v3.1 base score of 4.4, indicating moderate severity, and is characterized by a local attack vector, low attack complexity, high privileges required, and no user interaction needed. Microsoft assessed the likelihood of exploitation as unlikely and has released security updates for affected products, including Windows Server 2025 and various versions of Windows 11. The vulnerability primarily affects organizations with strict access controls and monitoring protocols. Security researchers from Kunlun Lab are credited with responsibly disclosing this vulnerability.

Winsage

November 10, 2025

Advancing security with Windows and Surface | Microsoft SFI Report Nov 2025

Microsoft is committed to security through its Secure Future Initiative (SFI), which employs 34,000 engineers to enhance cybersecurity. The November 2025 SFI Progress Report outlines advancements in security, including principles of Secure by Design, Secure by Default, and Secure Operations integrated into Windows and Surface products. Key updates include: - Windows 11 introduces passwordless sign-in with Passkeys and FIDO2 credentials to reduce phishing risks. - Phishing-resistant multi-factor authentication (MFA) is now widely used, lowering account compromise risks. - Windows Hotpatch allows security updates without device restarts, achieving 81% compliance within 24 hours of Patch Tuesday. - Windows 11 features quick machine recovery for automatic, cloud-connected recovery from boot failures. Surface devices lead in security by enabling all recommended features by default and developing memory-safe firmware to address vulnerabilities. Notably, 70% of security vulnerabilities are linked to memory safety issues, and Surface uses Rust-based UEFI firmware to enhance defenses. Surface also develops Windows drivers in Rust to eliminate memory safety bugs and shares innovations through the Open Device Partnership to improve security across the ecosystem.

Winsage

November 4, 2025

Microsoft WSUS Patch Breaks Hotpatching on Windows Server 2025

A recent Microsoft security update (KB5070881) aimed at fixing a critical vulnerability in the Windows Server Update Service (WSUS) inadvertently disrupted hotpatching for some Windows Server 2025 systems enrolled in the Hotpatch program. This disruption prevents affected servers from applying updates without requiring a restart, forcing administrators to revert to traditional cumulative updates until January 2026. The vulnerability, CVE-2025-59287, allowed potential remote code execution by exploiting weaknesses in WSUS. Microsoft has since released a new update (KB5070893) that addresses the vulnerability while restoring hotpatching capabilities for those who have not yet installed the problematic update.

Winsage

November 3, 2025

Microsoft: Patch for WSUS flaw disabled Windows Server hotpatching

An out-of-band security update, KB5070881, has disrupted the hotpatching feature for some Windows Server 2025 devices. This update was released alongside reports of the CVE-2025-59287 remote code execution vulnerability. The Cybersecurity and Infrastructure Security Agency (CISA) has instructed U.S. government agencies to strengthen their systems against this vulnerability. Microsoft has acknowledged that the OOB update caused some Hotpatch-enrolled Windows Server 2025 systems to lose their enrollment status and has ceased distributing the update to these devices. Those who installed the update will not receive Hotpatch updates in November and December but will get standard monthly security updates. Administrators can install the KB5070893 security update to address the CVE-2025-59287 flaw without disrupting hotpatching. Microsoft has also disabled the display of synchronization error details in its WSUS error reporting system and resolved various issues affecting Windows 11.

Winsage

October 3, 2025

Transforming security and compliance at Microsoft with Windows Hotpatch

Security updates are crucial for system integrity, but traditionally require a reboot, causing productivity interruptions. Microsoft has introduced Windows Hotpatch, which allows critical updates to be applied without rebooting, enhancing compliance and user satisfaction. Hotpatch modifies in-memory code while the system is operational, leading to immediate updates without downtime. It is designed for efficiency with small payloads that minimize performance impact. Hotpatch updates undergo the same validation as standard updates and can address zero-day vulnerabilities without requiring a reboot. This technology is available for Windows 11 version 24H2 or later, Windows 365, Azure Virtual Desktop, and Windows Server 2022/2025 Azure Edition, with appropriate licensing. Hotpatch has evolved from internal server capabilities to support client machines and integrates with Autopatch, automating the update process for enterprise environments. Microsoft Digital plans to scale Hotpatch to 450,000 devices within four months, achieving high compliance rates quickly—81% within 24 hours and 90% within five days, compared to previous timelines of up to nine months. Since its general availability in April, Hotpatch has been deployed to over 4 million devices globally, enhancing user experience by making updates seamless and unobtrusive. Plans for further expansion and improvements in compliance visibility and reporting are underway.

Winsage

June 26, 2025

The Windows Resiliency Initiative: Building resilience for a future-ready enterprise

Resilience is now a strategic necessity for organizations, prompting Microsoft to launch the Windows Resiliency Initiative (WRI) to integrate resilience and security into the Windows platform. In September 2024, Microsoft held the Windows Endpoint Security Ecosystem Summit (WESES) with endpoint security vendors and government representatives to discuss enhancing resilience. Following the summit, collaboration with Microsoft Virus Initiative (MVI) partners has increased, focusing on improving Windows security and reliability through rigorous testing and safe deployment practices. Next month, Microsoft will begin a private preview of a new Windows endpoint security platform for select MVI partners, allowing security solutions to operate outside the Windows kernel for better reliability. Microsoft has released the Windows Resiliency Initiative e-book to guide organizations in building resilience. Innovative products introduced under the WRI include: - Quick machine recovery (QMR) for faster recovery from unexpected restarts, reducing downtime to approximately two seconds. - Microsoft Connected Cache to enhance bandwidth efficiency during updates by caching content locally. - Universal Print anywhere for secure printing from any location. - Hotpatch updates for critical security updates without requiring a restart. - Windows 365 Reserve for secure access to a temporary Cloud PC during device disruptions.

Winsage

June 26, 2025

Microsoft rolls out Windows security changes to prevent another CrowdStrike meltdown

Last summer's CrowdStrike incident caused significant disruptions in healthcare, banking, and air travel, resulting in billions of dollars in damages. In response, Microsoft held a security summit with experts from CrowdStrike and other firms to address vulnerabilities. Microsoft announced Safe Deployment practices and architectural changes to enhance Windows security, including relocating third-party security drivers from the Windows kernel to user space. This change aims to reduce risks associated with kernel-level flaws. Upcoming features in Windows 11 24H2 include a streamlined crash report process, replacing the Blue Screen of Death with an "unexpected restart" screen, and a quick machine recovery (QMR) capability to automate fixes during outages. Additionally, Windows Autopatch will allow network administrators to deploy updates with fewer required restarts for Windows 11 Enterprise PCs, limiting them to once every three months.

Winsage

May 24, 2025

Microsoft Tells Nearly All Windows Users—You Must Reboot Your PC

This month's KB5058497 update for Windows 11 24H2 introduces the first 'hotpatch' update, allowing installation without a reboot, but it is only available for Windows 11 24H2 Enterprise users. There is no timeline for extending this feature to Pro and Home users. To use hotpatch updates, users must have a Microsoft subscription that includes Windows 11 Enterprise E3, E5, or F3, Windows 11 Education A3 or A5, or a Windows 365 Enterprise subscription, along with devices running Windows 11 Enterprise version 24H2 (Build 26100.2033 or later), an x64 CPU, Microsoft Intune for deployment management, and Virtualization-based Security (VBS) enabled. Users of Windows 11 24H2 or older versions must reboot their systems to apply new security updates, except for specific patches for Windows Defender, while every third update will still require a reboot. KB5058497 is scheduled to be released between May and June 2025 during the 'no restart' period, and it has been reported to install seamlessly without prompting for a reboot. Users of Windows 11 Home and Pro still face the traditional monthly reboot requirement for updates.

Winsage

April 30, 2025

Microsoft: Windows Server hotpatching to require subscription

Microsoft will transition hotpatching for Windows Server 2025 to a paid subscription model starting July 1, 2025, with a cost of [openai_gpt model="gpt-4o-mini" prompt="Summarize the content and extract only the fact described in the text bellow. The summary shall NOT include a title, introduction and conclusion. Text: Microsoft has made a significant announcement regarding the future of hotpatching for Windows Server 2025, a feature that allows administrators to apply security updates without the need for system restarts. As the company prepares for the general availability of this service, it will transition to a paid subscription model starting July 1, 2025. Subscription Details and Preview Phase In a proactive move, Microsoft is encouraging administrators to take advantage of the free preview of hotpatching before it becomes a subscription-based service. This opportunity will remain available until June 30, after which those currently testing the service will be automatically subscribed unless they opt out. “Hotpatching for Windows Server 2025, made available in preview in 2024, will become generally available as a subscription service on July 1st, 2025. With hotpatching, we are taking what was previously an Azure-only capability and now making it available to Windows Server machines outside of Azure through Azure Arc,” Microsoft stated. Upon the subscription launch, hotpatching will be priced at .50 USD per CPU core per month. To utilize this feature in multi-cloud environments or on-premises, users will need both a Hotpatch service subscription and an Azure Arc-connected server running Windows Server 2025 Standard or Datacenter. How to Enable Hotpatching Enabling hotpatching on your server is a straightforward process. First, connect your server to Azure Arc by following the specified steps. Next, navigate to Azure Update Manager within the Azure Portal, select your Azure Arc-enabled server, and check the hotpatching option as outlined in the provided documentation. A Brief History of Hotpatching Hotpatching has been a part of Microsoft's offerings since February 2022, initially available for Windows Server 2022 Datacenter: Azure Edition. This feature allows for the deployment of security updates by patching the in-memory code of running processes, eliminating the need for reboots after each installation. However, it is important to note that servers still require reboots for updates delivered through the standard Windows update channel, which are not included in the Hotpatch program. This includes non-Windows updates, such as .NET patches, and Windows non-security updates. Microsoft began public testing of hotpatching for Windows Server 2025 in September 2024, with further expansions to Windows 11 24H2 and Windows 365 following in November 2024. By April 2025, hotpatch updates will be generally available for business customers using Windows 11 Enterprise 24H2 on x64 (AMD/Intel) systems." max_tokens="3500" temperature="0.3" top_p="1.0" best_of="1" presence_penalty="0.1" frequency_penalty="frequency_penalty"].50 per CPU core per month. A free preview of the service is available until June 30, 2025, after which users testing the service will be automatically subscribed unless they opt out. Hotpatching allows administrators to apply security updates without system restarts and will be available for Windows Server machines outside of Azure through Azure Arc. To enable hotpatching, servers must be connected to Azure Arc and configured via the Azure Update Manager. Hotpatching was initially introduced in February 2022 for Windows Server 2022 Datacenter: Azure Edition and allows for in-memory code updates, but standard Windows updates still require reboots. Public testing for Windows Server 2025 began in September 2024, with general availability for Windows 11 Enterprise 24H2 expected by April 2025.