importantSYS.SOURCE: The Hacker News• 2026-07-06T23:07:01+05:30

Linux KVM Hypervisor Flaw Allows Guest VM to Escape Host on x86 Systems

#KVM#Hypervisor#x86#Guest-to-Host Escape#CVE

A vulnerability in the Linux KVM hypervisor, dubbed 'Januscape,' allows a guest virtual machine to potentially corrupt the host kernel's state, potentially leading to full host code execution. This flaw affects both Intel and AMD x86 systems and poses a significant threat to multi-tenant cloud environments with nested virtualization enabled.

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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> DISCOVERY OF -YEAR-OLD LINUX KERNEL FLAW (CVE--) ALLOWS ROOT AND CONTAINER ESCAPE > CISA UPDATES KEV CATALOG WITH FOUR ACTIVELY EXPLOITED VULNERABILITIES IN ADOBE, JOOMLA, AND LANGFLOW > EXPLOITING PROMPT INJECTION IN GITHUB AGENTIC WORKFLOWS TO ACCESS PRIVATE REPOSITORIES > OPENAI ANNOUNCES PUBLIC LAUNCH OF GPT-. SOL, TERRA, AND LUNA THIS THURSDAY > IMPLEMENTING A MINIMAL ZFS NAS USING DEBIAN AND SAMBA WITHOUT COMMERCIAL NAS SOLUTIONS > GUIDE TO IMAGING AND PRESERVING 8-INCH, 5.25-INCH, 3.5-INCH, AND 3-INCH FLOPPY DISKS > ANALYSIS OF THE ACCURACY AND RELIABILITY OF THE ECONOMIST'S ECONOMIC REPORTING > OFFICIAL LINEAGEOS PROJECT STATISTICS AND METRICS > CHIPTUNE RADIO: CONTINUOUS STREAM OF 8-BIT AND TRACKER MUSIC > THE MATHEMATICAL BASIS AND APPLICATIONS OF BENFORD'S LAW IN REAL-WORLD DATASETS> DISCOVERY OF -YEAR-OLD LINUX KERNEL FLAW (CVE--) ALLOWS ROOT AND CONTAINER ESCAPE > CISA UPDATES KEV CATALOG WITH FOUR ACTIVELY EXPLOITED VULNERABILITIES IN ADOBE, JOOMLA, AND LANGFLOW > EXPLOITING PROMPT INJECTION IN GITHUB AGENTIC WORKFLOWS TO ACCESS PRIVATE REPOSITORIES > OPENAI ANNOUNCES PUBLIC LAUNCH OF GPT-. SOL, TERRA, AND LUNA THIS THURSDAY > IMPLEMENTING A MINIMAL ZFS NAS USING DEBIAN AND SAMBA WITHOUT COMMERCIAL NAS SOLUTIONS > GUIDE TO IMAGING AND PRESERVING 8-INCH, 5.25-INCH, 3.5-INCH, AND 3-INCH FLOPPY DISKS > ANALYSIS OF THE ACCURACY AND RELIABILITY OF THE ECONOMIST'S ECONOMIC REPORTING > OFFICIAL LINEAGEOS PROJECT STATISTICS AND METRICS > CHIPTUNE RADIO: CONTINUOUS STREAM OF 8-BIT AND TRACKER MUSIC > THE MATHEMATICAL BASIS AND APPLICATIONS OF BENFORD'S LAW IN REAL-WORLD DATASETS