kvm security

About this tag
KVM security on WindowsForum covers Linux Kernel-based Virtual Machine vulnerabilities that affect Windows workloads running on KVM infrastructure. Recent discussions focus on CVE-2026-46113, a KVM x86 shadow paging use-after-free flaw; CVE-2026-45987, an AMD nested virtualization interrupt-shadow hang after restore; CVE-2026-46071, an AMD nSVM LBR clean bit issue; CVE-2026-31588, a KVM x86 MMIO use-after-free; and CVE-2022-49610, a VMX RSB underflow patch. These threads emphasize that while these are Linux kernel bugs, they matter to Windows users when Windows VMs run on Linux/KVM hosts, cloud platforms, or nested virtualization stacks. The tag provides timely alerts and practical patching guidance for administrators managing mixed virtualization environments.

  1. CVE-2026-46113: KVM x86 Shadow Paging Use-After-Free—Patch Your Linux Hosts

    Linux kernel maintainers published CVE-2026-46113 on May 28, 2026, describing a KVM x86 shadow paging use-after-free flaw that can leave stale reverse-map entries after an unexpected guest frame number appears in a shadow page. The bug is ugly not because it has a catchy exploit name, but...
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    • kvm security linux kernel cve shadow paging virtualization patching
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    • Forum: Security Alerts

  2. CVE-2026-45987: KVM AMD Nested Virtualization Interrupt-Shadow Hang After Restore

    CVE-2026-45987 is a newly published Linux kernel KVM vulnerability, disclosed by kernel.org and listed by NVD on May 27, 2026, involving AMD nested virtualization state handling that can cause an L2 virtual machine to hang after restore or migration. The bug is not a flashy remote-code-execution...
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    • amd nested virtualization kvm security linux kernel vulnerability vm migration
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    • Forum: Security Alerts

  3. CVE-2026-46071 KVM Nested Virtualization Fix: LBR Clean Bit in AMD nSVM

    CVE-2026-46071 is a Linux kernel KVM vulnerability published by NVD on May 27, 2026, affecting AMD nested virtualization code where KVM’s nSVM path incorrectly dirtied the LBR clean bit in a guest-owned VMCB during nested VM exit handling. The fix is small, but the signal is not: modern...
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    • amd nested virtualization kvm security linux kernel cve vmcb lbr
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    • Forum: Security Alerts

  4. CVE-2026-31588: KVM x86 MMIO use-after-free—Why Linux hypervisors need patching

    CVE-2026-31588 is the kind of Linux kernel flaw that looks tiny in code review and important in production: a narrow KVM x86 MMIO use-after-free triggered by page-splitting emulated writes, userspace exits, and stale stack-backed data. The fix changes how small write values are stored when KVM...
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    • kvm security linux kernel mmio memory safety virtualization patching
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    • Forum: Security Alerts

  5. KVM VMX RSB Underflow Patch CVE-2022-49610: Strengthening Linux Hypervisors

    A small but consequential change to the Linux kernel’s KVM VMX path — registered as CVE‑2022‑49610 — closes a theoretical window where the CPU’s Return Stack Buffer (RSB) could underflow between the time the guest’s speculative-control state is set and the actual vmenter instruction, removing a...
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    • kvm security linux kernel speculative execution vmx patch
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    • Forum: Security Alerts