Access Control Vulnerability in Xen Hypervisor
CVE-2026-102703

Currently unrated

Key Information:

Vendor

Xen Project
Status
Xen Project
Vendor
CVE Published:
4 November 2026

What is CVE-2026-102703?

An access control vulnerability exists in the Xen Hypervisor, related to improper validation during Grant Copy operations. The issue arises when frame numbers and grant references are incorrectly mixed, potentially leading to unauthorized access to memory areas. This flaw compromises the expected access control mechanisms, allowing improper copying operations across memory pages. Users of affected Xen Hypervisor versions are urged to review the advisory for mitigation strategies and apply the necessary patches.

Affected Version(s)

Xen consult Xen advisory XSA-523

References

https://xenbits.xenproject.org/xsa/advisory-523.html

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Anthropic using Claude, then validated by Stephan Lipp of Ada Logics. It was then independently reported by the CodeAnt AI Security Research Team.
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