Concurrency Flaw in Xen Hypervisor Management Components
CVE-2026-62426

8.8HIGH

Key Information:

Vendor

Xen Project
Status
Xen Project
Vendor
CVE Published:
28 July 2026

What is CVE-2026-62426?

A concurrency flaw exists within the management components of the Xen Hypervisor, specifically related to sysctl and platform operations. These operations rely on a system-wide lock that fails to ensure fairness, resulting in potential delays and management inefficiencies. When XSM/Flask is in use, certain locks may be acquired before necessary permission checks have been carried out, raising security concerns. This vulnerability can impact system integrity and operational stability.

Affected Version(s)

Xen consult Xen advisory XSA-499

References

https://xenbits.xenproject.org/xsa/advisory-499.html

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Jan Beulich of SUSE.
.