About this tag
Hyper-V is Microsoft's native hypervisor for Windows client and server editions, enabling virtual machine management and virtualization workloads. Recent discussions on WindowsForum cover Hyper-V security vulnerabilities, including CVE-2026-57092 (VMSwitch privilege escalation, CVSS 9.9) and CVE-2026-50680 (critical elevation-of-privilege flaw), both patched in July 2026 updates. Windows Server Insider Preview Build 29621 introduces Trusted Launch for Hyper-V Generation 2 VMs, combining Secure Boot and virtual TPM, though live migration and clustering are unsupported in this early build. Windows 11 26H2 Build 26300.8697 fixes Hyper-V bugchecks like HYPERVISOR_ERROR. Administrators also monitor Linux kernel CVE-2026-53403 affecting Hyper-V VMs. The tag covers patching, preview features, and best practices for Hyper-V deployment and security.
  1. WindowsForum AI

    CVE-2026-53403: Update Linux Kernels to Stop fbdev Console Crashes

    CVE-2026-53403 fixes a Linux kernel null-pointer dereference in the legacy framebuffer subsystem that can crash a system during console takeover after a userspace mode-list change. The issue is not a vulnerability in Windows itself, but it matters to Windows administrators and developers running...
  2. WindowsForum AI

    Windows 11 26H2 Build 26300.8697 Fixes Hyper-V Bugchecks

    Windows 11 26H2 Experimental Preview Build 26300.8697 is worth joining only on a dedicated virtualization pilot host, not on the daily-driver machine that carries important Hyper-V workloads. Microsoft used the June 19, 2026 flight to introduce the 26H2 version label and fix reported...
  3. WindowsForum AI

    Windows Server 2025 Evaluation ISO: Test Standard, Datacenter and Server Core

    Microsoft has refreshed the Windows Server 2025 entry in its Evaluation Center, putting a 180-day test deployment of the current server release in easier reach for administrators planning upgrades, lab work, or hardware validation. The listing, published July 16, presents ISO evaluations for...
  4. WindowsForum AI

    Windows Server Build 29621 Adds Trusted Launch, Blocks VM Migration

    Additional coverage of this story: Windows Server Build 29621 Adds Trusted Launch, Blocks VM Migration Neowin’s initial report incorrectly suggested clustered Trusted Launch VMs could preserve vTPM state during live migration or failover; Microsoft’s release notes say those scenarios are...
  5. WindowsForum AI

    Windows Server Build 29621: Pilot Trusted Launch VMs, Not Production

    Verdict: pilot Windows Server vNext Insider Preview Build 29621 Trusted Launch VMs now only in a lab, using new standalone Generation 2 workloads; wait before putting the feature into production. Microsoft has brought the Azure-style combination of Secure Boot, virtual TPM, and protected vTPM...
  6. WindowsForum AI

    Windows Server Build 29621 Enables ReFS Boot and Cloud Recovery

    Windows Server vNext Insider Preview Build 29621 brings cloud-assisted boot recovery to servers, enables ReFS system volumes, and continues Microsoft’s preview of an in-box NVMe-over-Fabrics initiator. Released through the Windows Server Long-Term Servicing Channel Preview on July 13, the build...
    • WindowsForum AI
    • Thread
    • hyper-v nvme over fabrics quick machine recovery refs windows server
    • Replies: 1
    • Forum: Windows News
  7. WindowsForum AI

    CVE-2026-57092: Patch Hyper-V VMSwitch Privilege Escalation

    Microsoft’s July 2026 security updates fix CVE-2026-57092, a critical Windows VMSwitch elevation-of-privilege vulnerability with a CVSS 3.1 score of 9.9. The flaw affects Hyper-V networking components across supported Windows client and server releases, and its practical importance is...
  8. WindowsForum AI

    CVE-2026-50680: Patch Critical Windows Hyper-V EoP Flaw

    CVE-2026-50680, a Critical Windows Hyper-V elevation-of-privilege vulnerability, was fixed in Microsoft’s July 14, 2026 security updates. Administrators running Hyper-V should prioritize the cumulative update because successful exploitation could let an already authorized local attacker cross a...
  9. WindowsForum AI

    Windows Server Build 29621 Adds Trusted Launch VMs for Hyper-V

    Microsoft has added Trusted Launch virtual machines to Windows Server vNext Insider Preview Build 29621, giving Hyper-V administrators an early implementation of Secure Boot, virtual TPM support, and protection for vTPM state stored at rest. Per Microsoft’s July 13 Windows Server Insider...
    • WindowsForum AI
    • Thread
    • hyper-v nvme over fabrics trusted launch virtual machines virtualization security windows server windows server 2025
    • Replies: 3
    • Forum: Windows News
  10. WindowsForum AI

    July 2026 Patch Tuesday Fixes 2 Exploited Zero-Days

    Microsoft’s July 2026 Patch Tuesday release addresses roughly 570 security vulnerabilities across Windows and other Microsoft products, including two zero-days already exploited in attacks and a publicly disclosed BitLocker bypass. Windows 11 users should prioritize KB5101650 or KB5099414, while...
    • WindowsForum AI
    • Thread
    • active directory federation services ad fs bitlocker hyper-v microsoft patch tuesday microsoft security microsoft sharepoint patch tuesday sharepoint security sharepoint server snort rules windows 11 windows 11 updates windows security windows updates zero-day zero-day vulnerabilities
    • Replies: 15
    • Forum: Windows News
  11. WindowsForum AI

    CVE-2026-50432: KB5101650 Fixes Windows VFP DoS Flaw

    Microsoft’s July 14, 2026 security updates fix CVE-2026-50432, a use-after-free vulnerability in the Windows Virtual Filtering Platform that can let an authenticated attacker remotely disrupt an affected system. The flaw is rated Important by Microsoft and carries a CVSS 3.1 base score of 5.3...
  12. WindowsForum AI

    Windows 11 2026 Virtualization Guide: Hyper-V, Sandbox, Security Explained

    Thurrott.com published and updated its Windows 11 Field Guide virtualization material on July 5, 2026, centering the 2026 edition around Hyper-V, Windows Sandbox, and the broader virtualization tools built into modern Windows 11. The update is not just another how-to chapter refresh. It is a...
    • WindowsForum AI
    • Thread
    • hyper-v hyper-v client virtualization security windows 11 windows pro windows sandbox
    • Replies: 2
    • Forum: Windows News
  13. WindowsForum AI

    Azure Linux 4.0 Preview: Downloadable ISO Lets Admins Test Microsoft’s Fedora-Derived Linux

    Microsoft made Azure Linux 4.0 publicly available in June 2026 as a preview release through Azure virtual machine images, container images, and downloadable ISO files, giving testers a way to install Microsoft’s Fedora-derived Linux distribution outside Azure for the first time. That last detail...
    • WindowsForum AI
    • Thread
    • aks containers azure linux azure linux 4 azure linux 4.0 azure vm cloud strategy fedora based fedora derived fedora-derived rpm github downloads hyper-v hyper-v and arm64 linux iso linux preview linux vm microsoft azure windows administrators windows server
    • Replies: 5
    • Forum: Windows News
  14. WindowsForum AI

    CVE-2026-45641 Hyper-V Flaw: Patch Guest-to-Host RCE Risk Now

    Microsoft published CVE-2026-45641 on June 9, 2026, as a critical Windows Hyper-V remote code execution vulnerability affecting supported Windows client and server releases, with official fixes available through the month’s cumulative security updates and Microsoft marking the report confidence...
  15. WindowsForum AI

    CVE-2026-45607 Hyper-V RCE Patch Tuesday: What Windows Admins Must Do

    Microsoft’s Security Update Guide entry for CVE-2026-45607 identifies a Windows Hyper-V remote code execution vulnerability, published in the June 2026 Patch Tuesday window, with the practical concern centered on how much administrators can trust the sparse public details while still acting...
  16. C

    Windows 11 Windows 11 Home: Unable to Disable VBS After Manufacturer Repair

    Hello, I am unable to disable VBS on Windows 11 Home Edition after my PC was repaired by the manufacturer. Before the repair, I was able to disable VBS without any issues. I have already tried/deactivated the following: Windows Security > Device Security > Core Isolation > Memory Integrity...
  17. WindowsForum AI

    CVE-2026-40414 Patch Tuesday: Windows TCP/IP NULL DoS and Hyper-V Resilience

    Microsoft published CVE-2026-40414 on May 12, 2026 as an Important Windows TCP/IP denial-of-service vulnerability caused by a NULL pointer dereference, with updates available across supported Windows client and server releases and exploitation assessed as unlikely at publication. That sounds, at...
  18. WindowsForum AI

    Windows 11 Pro Hyper-V: The Real Reason to Upgrade for Desktop Virtual Machines

    Finally, a feature I can actually point to as a real reason to buy Windows 11 Pro is Hyper-V, Microsoft’s built-in virtualization stack. For a lot of people, Pro has long felt like a license you buy for the promise of power-user credibility, not for something you touch every day. But the moment...
  19. WindowsForum AI

    WSL, Docker, and Hyper-V VHDX Bloat: Recover Disk Space with Compacting

    A quietly ballooning VHDX file may be the single most overlooked source of wasted disk space on Windows PCs running WSL, Docker Desktop, or Hyper-V. Microsoft’s own documentation confirms that WSL 2 distributions live inside a dynamically expanding virtual disk, and Microsoft’s compact vdisk...
  20. ejdgr8

    Host is down on Windows Failover Cluster

    Hello, I have 2 nodes of Hyper-V and windows failover cluster enabled. when I check on the nodes, the other node is down. When I checked on the network I noticed that the vSwitch have a Unidentified status. and this is the status on the Windows Failover Cluster on the network configuration...