linux kvm

About this tag
The linux kvm tag on WindowsForum covers Linux Kernel-based Virtual Machine vulnerabilities and fixes, particularly those affecting nested virtualization, AMD SVM and SEV-SNP, and Intel EPT. Recent threads detail CVEs such as CVE-2026-46131 (nested EPT/NPT TLB flush state bug), CVE-2026-46076 (AMD nested VMMCALL routing), CVE-2026-46082 (INVLPGA exception handling), CVE-2026-46014 (LBR save/restore), CVE-2026-46059 (NextRIP save/restore), CVE-2026-31591 (SEV-SNP vCPU locking race), and CVE-2026-31590 (SEV memory-encryption warning-to-DoS). These discussions emphasize that while these are Linux host-side issues, they intersect with Windows workloads running as guests, making them relevant for administrators managing mixed virtualization environments.

  1. CVE-2026-46131: Fixing Linux KVM Nested EPT/NPT Hyper-V TLB Flush State Bug

    CVE-2026-46131 is a newly published Linux kernel KVM vulnerability, disclosed by kernel.org and recorded by NVD on May 28, 2026, involving incorrect handling of nested Intel EPT and AMD NPT state during slow Hyper-V TLB flush hypercalls on x86 hosts. The bug is not a Windows flaw, but it lives...
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    • cve 2026-46131 hyper-v enlightenments linux kvm nested virtualization
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  2. CVE-2026-46076: KVM AMD Nested Virtualization Fix for VMMCALL Hypercall Routing

    CVE-2026-46076 is a newly published Linux kernel KVM vulnerability, disclosed by kernel.org and recorded by NVD on May 27, 2026, that fixes incorrect AMD nested-virtualization handling of VMMCALL instructions when a second-level guest runs under an L1 hypervisor. The bug is narrow, technical...
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    • amd svm cve-2026-46076 linux kvm nested virtualization
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  3. CVE-2026-46082 KVM AMD SVM Fix: INVLPGA Now Raises #UD When SVME Off

    CVE-2026-46082 is a newly published Linux kernel KVM vulnerability, disclosed by kernel.org and listed by NVD on May 27, 2026, that fixes AMD SVM emulation so INVLPGA correctly raises an invalid-opcode exception when EFER.SVME is disabled. That is a mouthful, but the practical story is simpler...
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    • amd svm kernel security linux kvm nested virtualization
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  4. CVE-2026-46014: KVM AMD SVM LBR Save/Restore Bug and Fix for Nested Virtualization

    CVE-2026-46014 is a Linux kernel KVM vulnerability published by NVD on May 27, 2026, covering broken save-and-restore handling for Last Branch Record model-specific registers in KVM’s AMD SVM virtualization path, with related Intel VMX bookkeeping also corrected. The bug is not the kind of flaw...
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    • amd svm cve-2026-46014 linux kvm nested virtualization
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  5. CVE-2026-46059: KVM AMD Nested Virtualization NextRIP Save/Restore Fix

    CVE-2026-46059 is a newly published Linux kernel KVM vulnerability, received by NVD on May 27, 2026, affecting AMD nested virtualization logic in nSVM when KVM restores an L2 guest after its first VMRUN. It is not yet scored by NVD, and the public record still sits in the frustrating “awaiting...
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    • amd svm cve patch management linux kvm nested virtualization
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  6. CVE-2026-31591: Linux KVM AMD SEV-SNP vCPU Locking Race Can Crash Hosts

    CVE-2026-31591: Linux KVM SEV-SNP vCPU Locking Flaw Can Corrupt Guest State or Crash the Host CVE-2026-31591 is a Linux kernel vulnerability in KVM’s AMD SEV-SNP launch path. The issue affects the way KVM synchronizes Virtual Machine Save Areas, or VMSAs, when finalizing the launch of an SEV-SNP...
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    • kernel vulnerability linux kvm sev snp security windows tech news
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  7. CVE-2026-31590 and AMD SEV KVM: Warning-to-DoS risk for confidential VMs

    CVE-2026-31590 is not the kind of Linux kernel vulnerability that screams for emergency weekend patching, but it is exactly the kind of bug that matters in modern virtualization stacks. The issue sits in KVM’s AMD SEV memory-encryption path, where a userspace-controlled region size could...
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    • amd sev confidential computing cve 2026-31590 linux kvm
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    • Forum: Security Alerts