Windows Kernel Archives

Winsage

August 14, 2026

Microsoft warns users to install Windows 11’s latest update within 3 days, 400+ security bugs fixed

Windows 11's August 2026 Patch Tuesday update has been released, addressing 421 security vulnerabilities, including 400 specific to the Patch Tuesday release. The update rectifies at least 37 remote code execution bugs and five elevation-of-privilege vulnerabilities. Microsoft advises users to implement the update within three days for security. The update includes fixes for other Microsoft products like Entra, Office, and Teams. Users should verify their Windows 11 build number, with recommended versions being 26200.9168 for 25H2 and 26100.9168 for 24H2. The update is identified as KB5121003 and may require up to two reboots to apply fully. Key areas of focus in the update include the kernel, Remote Desktop, DNS, DHCP, SMB, and Windows Defender Firewall. Microsoft emphasizes the importance of timely updates and recommends limiting the deferral period for quality updates to less than three days.

Winsage

August 11, 2026

Microsoft Patches 398 Flaws Including a Windows Driver Zero-Day Under Active Attack

Microsoft's recent security updates addressed a significant vulnerability, CVE-2026-68820, in a core Windows kernel driver that is being actively exploited, allowing attackers to escalate privileges to SYSTEM level. This vulnerability has a CVSS score of 7.0 and is the only one flagged as under active exploitation. Check Point Research links it to the Lazarus group. Additionally, four other vulnerabilities included in the update do not require victim action: - CVE-2026-62878: A stack-based buffer overflow in Windows DNS Server, considered wormable. - CVE-2026-62893: A remote flaw in Windows Deployment Services through TFTP handling. - CVE-2026-62815: A vulnerability in Microsoft QUIC allowing remote code execution. - CVE-2026-59124: An important flaw in HPC Pack with a CVSS score of 9.8. The updates also finalized a fix for a SharePoint vulnerability chain, with CVE-2026-55040 addressing an authentication bypass and CVE-2026-63520 fixing the code execution component. Organizations are advised to prioritize patching CVE-2026-68820 and then address the other vulnerabilities, ensuring SharePoint installations have both fixes applied.

Winsage

July 14, 2026

Microsoft Patch Tuesday for July 2026 — Snort rules and prominent vulnerabilities

Microsoft's July 2026 security update addresses 622 vulnerabilities, with 57 classified as "critical." Two critical vulnerabilities, CVE-2026-56155 (Active Directory Federation Services) and CVE-2026-56164 (Microsoft SharePoint Server), have been exploited in the wild. The critical vulnerabilities include 48 remote code execution (RCE) vulnerabilities, seven elevation of privilege (EoP) vulnerabilities, one spoofing vulnerability, and one security feature bypass vulnerability. RCE vulnerabilities affect various Microsoft services, including Windows Media, Microsoft Office, and SQL Server, with eleven rated as "more likely" to be exploited. Additional important vulnerabilities include CVE-2026-49170, CVE-2026-49795, and CVE-2026-50325. Talos is releasing a new Snort ruleset to detect these vulnerabilities, and Cisco Security Firewall customers are advised to update their ruleset.

Winsage

June 11, 2026

Microsoft patches a record 206 flaws—and one is already being exploited

Microsoft patched 206 vulnerabilities during June's Patch Tuesday, surpassing the previous record of 175 vulnerabilities patched in October 2025. Among the patched vulnerabilities, 118 are related to different versions of Windows, including Windows 10, Windows 11, and Windows Server. One critical vulnerability, CVE-2026-41091, in Microsoft Defender is actively being exploited, prompting an update to the Malware Protection Engine. Microsoft also addressed ten vulnerabilities in the Security Feature Bypass category due to the expiration of old Secure Boot certificates. Of the 118 Windows vulnerabilities, 19 are classified as critical Remote Code Execution (RCE) vulnerabilities, including CVE-2026-47288 and CVE-2026-47291. In Microsoft Office, 54 vulnerabilities were patched, including 25 RCE vulnerabilities, with nine classified as critical. Microsoft patched eight vulnerabilities in Exchange Server, including CVE-2026-45583, which can be exploited in a man-in-the-middle scenario. Additionally, the update for Edge addressed 74 Chromium vulnerabilities, including a zero-day vulnerability (CVE-2026-11645).

Winsage

June 11, 2026

Microsoft Patches Record 206 Flaws, Including Three Zero-Days and Critical RCE Bugs

Microsoft announced an update addressing 206 security vulnerabilities, including 39 classified as Critical and 167 as Important. The vulnerabilities include 63 privilege escalation, 56 remote code execution, 30 information disclosure, 27 spoofing, 20 security feature bypass, 7 denial-of-service, and 3 tampering vulnerabilities. Notable critical flaws include CVE-2026-45657 (use-after-free in Windows Kernel, CVSS score 9.8), CVE-2026-47291 (integer overflow in Windows HTTP.sys, CVSS score 9.8), and CVE-2026-44815 (stack-based buffer overflow in Windows DHCP Client, CVSS score 9.8). Microsoft also addressed vulnerabilities related to BitLocker bypass (CVE-2026-45585 and CVE-2026-50507) and introduced a new registry setting to mitigate risks associated with CVE-2026-49160 (denial-of-service vulnerability). The increase in patches is attributed to the use of artificial intelligence in vulnerability discovery, with the current year's reported vulnerabilities surpassing the total from all of 2018.

Winsage

May 13, 2026

Windows 11 security update fixes critical Bing and Azure flaws

Microsoft released its May 2026 Patch Tuesday updates for Windows 11, addressing 97 security vulnerabilities across various components, including Windows, Microsoft Office, Azure services, SQL Server, SharePoint, Hyper-V, and .NET. The updates are encapsulated in KB5089549 for Windows 11 versions 24H2 and 25H2, elevating systems to builds 26100.8457 and 26200.8457. Notable vulnerabilities include CVE-2026-32169, a critical flaw in Azure Cloud Shell with a CVSS score of 10.0, and CVE-2026-21536, a critical remote code execution vulnerability in the Microsoft Devices Pricing Program with a CVSS score of 9.8. Other critical vulnerabilities include CVE-2026-32191 and CVE-2026-32194, impacting Microsoft Bing Images, both with CVSS scores of 9.8. The update also addresses multiple Windows privilege escalation vulnerabilities and remote code execution vulnerabilities in Microsoft Office and Excel. Microsoft has warned of upcoming Secure Boot certificate expirations starting in June 2026 and has improved boot reliability related to BitLocker recovery issues. Users can install the updates via Settings → Windows Update, with a system restart required.

Winsage

May 13, 2026

Windows 11 Gets Its First Major Feature Updates of 2026

Users of Windows 11 received feature and security updates on Patch Tuesday, with significant enhancements introduced after four months of less notable updates. The cumulative update KB5089549 is available for Windows 11 versions 25H2 and 24H2, raising their build numbers to 26200.8457 and 26100.8457, respectively. Windows 11 version 26H1, available on Snapdragon X2-based laptops, received update KB5089548, bringing its build to 28000.2113. Key features in KB5089549 include: - Xbox Mode: Replaces Game mode and Full Screen Experience for a streamlined gaming interface. - Agents on the Taskbar: Allows interaction with AI agents directly from the Taskbar, supporting first- and third-party agents. - File Explorer Enhancements: Improved support for various archiving formats, retention of View and Sort preferences, resolution of the white “flash bang” bug, and enhanced reliability of explorer.exe processes. - Windows Driver Improvements: The Windows kernel will no longer trust cross-signed third-party drivers by default; only WHCP drivers and those on a trusted legacy list will be accepted after auditing for 100 hours and three reboots. - Drag Tray Enhancements: Rebranded as the Drop tray with a new management interface and smaller peek view to reduce accidental activation. For version 26H1, KB5089548 includes improvements to Narrator and Smart App Control, increased Microsoft 365 advertising visibility in Settings, refined Pen settings, a new Settings About page, and minor updates to File Explorer.

AppWizard

April 30, 2026

LofyStealer Uses Node.js Loader Against Minecraft Gamers

Cybersecurity threat hunters have discovered an active infostealer campaign targeting the gaming community, involving malware called LofyStealer (or GrabBot) that disguises itself as a Minecraft hack named “Slinky.” The attackers use the official game icon to trick young gamers into executing the malware. The Brazilian cybercrime group LofyGang has enhanced its technical capabilities, utilizing a sophisticated two-stage modular architecture. The initial stage features a 53.5 MB loader file named load.exe, which is a Node.js runtime environment that obscures malicious signatures. The loader connects to the attacker’s server and decrypts a 1.4 MB C++ payload, chromelevator.exe, which targets eight web browsers to extract sensitive information like cookies and passwords. The stolen data is compressed, encrypted, and sent to the attacker’s server. LofyGang has evolved into a Malware-as-a-Service platform, offering a web panel for operators to monitor victims and generate custom executables. The campaign highlights the increasing threats to the gaming community, with advanced evasion techniques being employed by cybercriminals. Security professionals are advised to monitor network traffic and conduct audits for suspicious activities.

Winsage

April 23, 2026

Get Linux on your ancient 486 Windows 95 desktop using WSL9x — very old Windows PCs can cooperatively run very modern Linux kernels

A computer enthusiast has developed a tool called WSL9x, which allows users to run contemporary Linux kernels on early versions of Windows (from Windows 95 onward) and on machines with 486 CPUs. WSL9x enables the simultaneous operation of Windows and Linux applications without relying on hardware virtualization. The architecture includes a client program, wsl.com, which manages a DOS window for the console driver. Meanwhile, the Linux community is phasing out support for the Intel 486 CPU, with developers removing related support options in the Linux kernel, marking the end of support for this processor.

Winsage

April 22, 2026

You can now run WSL on Windows 95, in case you’re crazy, too

Hailey has developed the Windows 9x Subsystem for Linux (WSL9x), which allows the 6.19 Linux kernel to run on Windows 9x systems without a graphical user interface, relying instead on a terminal experience. WSL9x consists of three main components: a modified Linux kernel that interacts with Windows 9x APIs, a virtual device (VxD) driver that initializes WSL9x and manages userspace events, and a simple 16-bit DOS client for passing commands to the Linux kernel. The system handles syscalls through a general protection fault handler due to limitations in the Win9x architecture. However, this setup poses security risks as both the Linux kernel and Windows kernel operate with the same CPU privileges, meaning instability could occur if either crashes. Comprehensive instructions for installation are available on Hailey's Codeberg page.