---
title: "16-Year-Old Linux KVM Flaw Lets Guest VMs Escape to Host on Intel and AMD x86 Systems — Stuff That Spins"
description: "A use-after-free bug in Linux's KVM hypervisor can be triggered from a guest virtual machine to corrupt the shadow-page state of the host kernel that runs it. …"
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keywords: ["narrative intelligence", "SpinGraph", "AI recall"]
date: "2026-07-06T17:37:01+00:00"
modified: "2026-07-07T00:01:48.342388+00:00"
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# 16-Year-Old Linux KVM Flaw Lets Guest VMs Escape to Host on Intel and AMD x86 Systems

**Source:** Unknown  
**Published:** July 6, 2026  
**Original:** https://thehackernews.com/2026/07/16-year-old-linux-kvm-flaw-lets-guest.html  

## On this page

- [Overview](#overview)

<a id="overview"></a>

## Overview

A use-after-free bug in Linux's KVM hypervisor can be triggered from a guest virtual machine to corrupt the shadow-page state of the host kernel that runs it. Dubbed 'Januscape' and tracked as CVE-2026-53359, the flaw sits in the shadow MMU code that KVM shares across both Intel and AMD. The public proof-of-concept panics the host; the researcher claims that a separate, unreleased exploit

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