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Critical PwnEscape Linux Kernel Vulnerability Lets Guest VMs Read Host Memory

The Hacker News
LinuxCVEVulnerabilityCritical

Overview

A serious vulnerability in the Linux kernel, identified as CVE-2026-99999 and dubbed PwnEscape, has been revealed, allowing virtual machines (VMs) to access the memory of the host system. This flaw is located within the networking code of the Linux kernel, meaning it affects multiple cloud environments, not just one particular setup. A researcher demonstrated this vulnerability on Vercel's cloud sandboxes, and the company confirmed the issue. This breach poses significant risks, as it could enable attackers to extract sensitive data from the host machine, potentially compromising the integrity and confidentiality of the systems involved. Companies using Linux-based virtual machines should be vigilant and take appropriate measures to safeguard their environments.

Key Takeaways

  • Affected Systems: Linux kernel versions affected, specifically in cloud environments using Vercel's live cloud sandboxes.
  • Action Required: System administrators should apply security patches and updates to the Linux kernel as they become available.
  • Timeline: Newly disclosed

Original Article Summary

A newly disclosed critical flaw in the Linux kernel allows code inside a virtual machine to read memory on the host computer it runs on. A researcher demonstrated the leak against Vercel's live cloud sandboxes, and Vercel confirmed it. The flaw, now tracked as CVE-2026-99999 and nicknamed PwnEscape, is in the Linux kernel's networking code, not in any one cloud's setup, so it reaches the shared

Impact

Linux kernel versions affected, specifically in cloud environments using Vercel's live cloud sandboxes.

Exploitation Status

The exploitation status is currently unknown. Monitor vendor advisories and security bulletins for updates.

Timeline

Newly disclosed

Remediation

System administrators should apply security patches and updates to the Linux kernel as they become available. It's advisable to monitor for updates from Linux distributions and implement any recommended security configurations to mitigate risks associated with this vulnerability.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Linux, CVE, Vulnerability, and 1 more.

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