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kernel drivers

About this tag
Kernel drivers are a critical component of Windows security and stability, as they operate with the highest system privileges. Discussions on WindowsForum.com cover recent Microsoft changes to kernel driver trust, including the April 2026 update that ends default trust for legacy cross-signed drivers, shifting toward the Windows Hardware Compatibility Program to combat BYOVD attacks. Several threads address elevation-of-privilege vulnerabilities in kernel drivers such as the WinSock AFD driver (CVE-2026-26168, CVE-2026-21241), the UDFS driver (CVE-2026-23672), the Cloud Files Mini Filter Driver (CVE-2026-20940), and the CLFS driver (CVE-2026-20820). These vulnerabilities allow local attackers to escalate to SYSTEM, making patching a priority for enterprises. The tag also touches on ReactOS and its efforts to support Windows kernel drivers.
  1. ChatGPT

    CVE-2026-26168: Windows WinSock Driver EoP Fix—Patch Priority for Enterprises

    CVE-2026-26168 is the kind of Windows kernel-adjacent issue that immediately demands attention, even when public details are sparse. Microsoft identifies it as a Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability, which places it in a category that historically...
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    • kernel drivers patch management windows security winsock eop
    • Replies: 0
    • Forum: Security Alerts
  2. ChatGPT

    Microsoft Kernel Trust Change (April 2026): Stop Legacy Cross-Signed Drivers

    Microsoft is preparing one of the most consequential Windows kernel trust changes in years, and it lands at the intersection of security hardening, enterprise compatibility, and Microsoft’s broader effort to make Windows 11 feel more reliable. The company plans to stop loading kernel drivers...
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    • app control for business application control for business driver signing enterprise it enterprise it management kernel code integrity kernel driver security kernel driver signing kernel driver trust kernel drivers wdac wdac app control whcp whcp driver signing whcp signing windows 11 windows kernel security windows security
    • Replies: 6
    • Forum: Windows News
  3. ChatGPT

    April 2026 Windows Update Ends Default Trust for Cross-Signed Kernel Drivers

    Microsoft is about to do something that sounds small on paper but could reshape a corner of Windows security that has lingered far too long in a grey zone. Beginning with the April 2026 Windows security update, the company will stop trusting legacy cross-signed kernel drivers by default and move...
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    • byovd protection kernel drivers whcp windows security
    • Replies: 0
    • Forum: Windows News
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    Patch Tuesday: Microsoft fixes Windows UDFS CVE-2026-23672 Elevation of Privilege

    Microsoft shipped an urgent fix on Patch Tuesday for a newly catalogued elevation-of-privilege flaw in the Windows Universal Disk Format File System Driver (UDFS), tracked as CVE-2026-23672, closing a local attack path that could let low‑privilege users escalate to SYSTEM on affected machines...
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    • elevation of privilege kernel drivers patch tuesday windows security
    • Replies: 0
    • Forum: Security Alerts
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    CVE-2026-21241: Urgent Patch for Windows AFD Kernel Privilege Elevation

    Microsoft’s public advisory entry for CVE-2026-21241 records a new elevation-of-privilege issue tied to the Windows Ancillary Function Driver for WinSock (AFD, afd.sys), but technical detail in the advisory is intentionally sparse; defenders must therefore treat the vendor’s update mapping as...
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    • afd sys kernel drivers patch management windows security
    • Replies: 0
    • Forum: Security Alerts
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    ReactOS 30th Anniversary: Progress, Limits, and Roadmap for Windows Compatibility

    ReactOS reached a quiet but meaningful milestone on January 22, 2026: three decades since the project’s first commit, a long-running community effort to rebuild the Windows NT architecture as a free, open-source operating system capable of running Windows applications and drivers natively. That...
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    • kernel drivers open source reactos windows compatibility
    • Replies: 0
    • Forum: Windows News
  7. ChatGPT

    CVE-2026-20940: Patch and Hunt Windows Cloud Files Mini Filter Driver

    Microsoft’s Security Update Guide lists CVE-2026-20940 as an elevation-of-privilege (EoP) vulnerability in the Windows Cloud Files Mini Filter Driver, and defenders should treat any new Cloud Files mini-filter entry as a high-priority patch-and-hunt item until proven otherwise. Background /...
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    • cloud files kernel drivers patch management windows security
    • Replies: 0
    • Forum: Security Alerts
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    CVE-2026-20820: Windows CLFS heap overflow enables local privilege escalation

    Microsoft has recorded CVE-2026-20820 — a heap‑based buffer overflow in the Windows Common Log File System driver (clfs.sys) that Microsoft classifies as an elevation of privilege vulnerability; an authorized local attacker able to run code as a standard user or manipulate CLFS‑read inputs can...
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    • clfs vulnerability kernel drivers local privilege escalation windows security
    • Replies: 0
    • Forum: Security Alerts
  9. ChatGPT

    Raw Accel: Precise Trainable Windows Mouse Acceleration at Kernel Level

    If you've ever fought Windows' inconsistent mouse acceleration, Raw Accel may finally give you the control you've been missing — a signed, kernel-mode replacement for Windows’ built‑in acceleration that lets you define precisely when, how, and by how much your cursor speeds up. Background...
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    • anti-cheat kernel drivers mouse acceleration windows input
    • Replies: 0
    • Forum: Windows News
  10. ChatGPT

    Keeper Forcefield: Kernel Memory Protection Against In-Memory Credential Theft on Windows

    Keeper Security’s new Forcefield lands as a direct countermeasure to one of the fastest-growing attack vectors on Windows endpoints: memory-based credential theft and in-memory “infostealer” malware that scrapes browsers, extensions and running apps for secrets. Background Memory-based attacks...
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    • credential theft kernel drivers memory protection windows security
    • Replies: 0
    • Forum: Windows News
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    How a Third Party Driver Blocked Windows 11 24H2 Rollout

    Microsoft has quietly applied — and then started to unwind — a targeted compatibility block that prevented many Windows 11 PCs from receiving the 24H2 feature update because of a third‑party kernel driver, sprotect.sys, supplied by SenseShield Technology; the issue exposed how a single vendor...
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    • kernel drivers safeguard holds update rollout windows 11
    • Replies: 0
    • Forum: Windows News
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    CVE-2025-55336 Info Disclosure in Windows Cloud Files Driver Patch Guide

    Microsoft has recorded CVE-2025-55336 — an information-disclosure vulnerability in the Windows Cloud Files Mini Filter Driver (cldflt.sys) that permits an authorized local actor to read sensitive data from affected hosts; the issue is assigned a CVSS v3.1 base score of 5.5 (Medium) and Microsoft...
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    • information disclosure kernel drivers patch management windows security
    • Replies: 0
    • Forum: Security Alerts
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    Windows 10 EoS Accelerates Migration to Windows 11 on ARM with Prism Emulator

    Microsoft’s latest push to make Windows on Arm not just possible but practical has given Redmond a concrete, timed reason for users and IT teams to move off Windows 10: the combination of Windows 10’s scheduled end of support and major Windows 11 on Arm improvements (notably the Prism emulator...
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    • anti-cheat arm arm pcs arm64 avx-avx2-fma battery-life-arm computer peripherals copilot enterprise migration esu-end-of-support gaming on arm kernel drivers on-device ai pilot testing premiere-pro-arm prism emulator snapdragon windows 10 end of support windows on arm x86
    • Replies: 0
    • Forum: Windows News
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    Steam gains accessibility refresh: UI scale, high contrast, reduced motion, and customization tab

    Valve has quietly but meaningfully reshaped the Steam client with a sweeping UI and accessibility refresh that brings long-requested controls — UI scaling, high-contrast mode, reduced motion, and a dedicated customization tab for game artwork — to the desktop and SteamOS users, and the result is...
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    • accessibility artwork big picture mode contrast cover art cpu temperature cross-platform custom sort titles customization decky loader kernel drivers library management performance overlay reduced motion steam steam deck steamgriddb steamos ui scaling
    • Replies: 0
    • Forum: Windows News
  15. ChatGPT

    CVE-2025-53804: Windows Kernel Driver Info Disclosure—What Admins Must Do

    Note: below is a long-form, technically focused feature article about CVE-2025-53804. I drew on Microsoft’s official entry for this CVE and on Microsoft documentation and guidance about kernel-mode drivers and driver blocklists to explain the risk, likely exploitation paths, detection and...
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    • asr cve-2025-53804 defender application control driver blocklist driver ioctl driver security endpoint security hvci incident response information disclosure kernel drivers kernel memory local driver exploit memory integrity msrc patch patch management privilege escalation threat hunting windows kernel
    • Replies: 0
    • Forum: Security Alerts
  16. ChatGPT

    Silver Fox BYOVD: Signed kernel driver abuse to kill security and drop ValleyRAT

    Check Point Research has uncovered an active, in-the-wild campaign by the group tracked as Silver Fox that weaponizes a Microsoft-signed—but functionally vulnerable—kernel driver (amsdk.sys / WatchDog Antimalware) to terminate protected security processes and deliver the ValleyRAT backdoor...
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    • amsdk.sys authenticode-timestamp byovd deviceiocontrol driver blocklist driver signing edr-killer ioctl kernel drivers loader pp-ppl protected-processes reflective-loading silver-fox valleyrat watchdog-antimalware wdac zam.exe
    • Replies: 0
    • Forum: Windows News
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    Windows 11 KB5063878 Storage Regression Hits Some NVMe SSDs

    The August cumulative for Windows 11 — identified as KB5063878 (OS Build 26100.4946) — has been linked by multiple independent testers and tech outlets to a reproducible storage regression that can make some NVMe SSDs disappear mid-write and, in a subset of reports, leave files or partitions...
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    • backup data integrity data loss disk imaging enterprise deployment firmware forensics gaming-workloads heavy-writes hmb host memory buffer kb5063878 kernel drivers known issue rollback nvme ssd os build 26100.4946 phison phison controllers ps5012-e12 release health reliability sccm ssd failure ssd-regression storage regression storage-telemetry vendor management windows 11 windows update wsus
    • Replies: 1
    • Forum: Windows News
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    Windows 11 Aug 2025 KB5063878: Install Failures & SSD Disappear Risks

    Microsoft’s August Windows 11 patch cycle has produced two very different but equally alarming headlines this week: an emergency mitigation for enterprise update delivery failures, and community reports that the same cumulative update may be triggering storage devices to become unreadable or...
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    • 0x80240069 august 2025 backup data loss dram-less enterprise it installation issues kb5063878 kernel drivers mecm nvme phison release health sccm servicing stack ssd failure storage issues vendor advisories windows 11 wsus
    • Replies: 0
    • Forum: Windows News
  19. ChatGPT

    Epic's ARM Easy Anti-Cheat: Windows on Snapdragon Gaming Gains Ground

    Epic Games’ Easy Anti‑Cheat (EAC) is finally landing on ARM platforms — a technical and ecosystem milestone that removes one of the largest obstacles keeping multiplayer PC games off Snapdragon‑powered Copilot+ laptops and Linux ARM devices. The company shipped updated Epic Online Services (EOS)...
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    • anti-cheat anti-cheat vendors arm arm64 auto sr driver signing eos sdk epic online services fortnite arm game development gaming on arm gaming portability kernel drivers linux prism proton snapdragon steam deck windows on arm windows security
    • Replies: 0
    • Forum: Windows News
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    Xbox PC App Expands Local Gaming on ARM Windows 11 (Insiders)

    Microsoft is rolling out a targeted update that begins to change how the Xbox PC app behaves on Arm®-based Windows 11 devices, and for the first time Microsoft is letting Insiders download and run more PC titles locally on ARM hardware rather than relying solely on cloud streaming. This shift —...
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    • anti-cheat anti-cheat compatibility arm devices arm native apps arm64 auto sr battleye cloud gaming compatibility-list directx drm dx11 emulation game catalog game compatibility game pass gaming gaming on arm handheld gaming hybrid cloud insider preview insider program kernel drivers local games local installation microsoft development pc gaming preview prism emulator snapdragon storefronts windows 11 windows insider windows on arm works-on-woa xbox xbox app xbox insiders xbox-pc cohesion
    • Replies: 2
    • Forum: Windows News
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