Access Control Issue in Xen Hypervisor Affects Multiple Versions
CVE-2026-62430

7.5HIGH

Key Information:

Vendor

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

What is CVE-2026-62430?

A vulnerability in the Xen Hypervisor allows a guest to manipulate CMOS memory access through an indirect I/O port pair. This flaw arises from a lack of proper locking mechanisms when caching the guest-chosen index. Consequently, if a guest modifies the index after it is validated, this could lead to an out-of-bounds read, exposing sensitive data or causing instability. System administrators should apply necessary patches and secure configurations to mitigate potential risks.

Affected Version(s)

Xen consult Xen advisory XSA-503

References

https://xenbits.xenproject.org/xsa/advisory-503.html

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.