Memory Management Vulnerabilities in Xen Hypervisor
CVE-2025-27466

9.8CRITICAL

Key Information:

Vendor

Xen Project
Status
Xen Project
Vendor
CVE Published:
11 September 2025

What is CVE-2025-27466?

Multiple vulnerabilities have been identified in the handling and accessing of guest memory pages in the Xen Hypervisor. One notable issue is a NULL pointer dereference that occurs during the update of the reference TSC area. Additionally, another vulnerability arises from incorrectly assuming that a SIM page is mapped when delivering a synthetic timer message. Furthermore, a race condition emerges in the mapping of the reference TSC page, allowing a guest to potentially free a page while it is still present in the guest's physical to machine (p2m) page tables. These issues could compromise system stability and security.

Affected Version(s)

Xen consult Xen advisory XSA-472

References

https://xenbits.xenproject.org/xsa/advisory-472.html

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered by Roger Pau Monné of XenServer.
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CVE-2025-27466 : Memory Management Vulnerabilities in Xen Hypervisor