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MACHINE AGE CARTOON

THE WALLS ARE MADE OF GLASS

By Zimbo · November 8, 2026

AI cartoon by Zimbo: Satirical cartoon: a robot in VM 1 peers through a glass XEN wall with a magnifying glass at the MEMORY filing cabinet in VM 2 while the neighboring robot sleeps at its laptop, on plain white paper.
Claude found the flaw letting one VM read every other VM's memory — and the wall between tenants turned out to be glass.Zimbo for AI News Page

The story behind the cartoon

The Xen Project published security advisory XSA-523 on November 3: two flaws in Xen's grant-copy feature let a malicious guest virtual machine read and write memory belonging to other virtual machines on the same host, including the privileged Dom0 control domain.

Every Xen version from 4.6 onward is affected, with no known mitigation short of patching — a decade-old bug in the code that walls off the cloud's tenants.

The discovery credit is the story: Anthropic found the flaws using Claude, validated by Stephan Lipp of Ada Logics and independently reported by the CodeAnt AI Security Research Team, and the fix commits carry an 'Assisted-by: Claude' line. Nothing suggests the flaws have been exploited.

The joke is the glass wall: the VM 1 robot peers through the transparent XEN partition with a magnifying glass at VM 2's MEMORY filing cabinet while its neighbor sleeps at its laptop.

READ THE FULL REPORT — Xen Project ↗

MORE ZIMBO ↓

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