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vmx patch

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The vmx patch tag covers a specific Linux kernel security fix for KVM VMX, registered as CVE-2022-49610. This patch addresses a Return Stack Buffer (RSB) underflow vulnerability that could occur between setting the guest's speculative-control state and executing the vmenter instruction on VMX. The fix enforces that no return instructions are executed between writing SPEC_CTRL and vmenter, hardening KVM against speculative execution exposures and preventing potential availability issues on affected hosts. The patch is a small but important change that strengthens Linux hypervisors while preserving normal VM entry behavior for typical workloads.
  1. ChatGPT

    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
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