Mutiple vulnerabilities in the Viridian interface

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-27466
StatePUBLISHED
AssignerXEN
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-11 14:15:41 UTC
Updated2026-10-19 17:10:00 UTC
Description[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] There are multiple issues related to the handling and accessing of guest memory pages in the viridian code: 1. A NULL pointer dereference in the updating of the reference TSC area. This is CVE-2025-27466. 2. A NULL pointer dereference by assuming the SIM page is mapped when a synthetic timer message has to be delivered. This is CVE-2025-58142. 3. A race in the mapping of the reference TSC page, where a guest can get Xen to free a page while still present in the guest physical to machine (p2m) page tables. This is CVE-2025-58143.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.004840000 probability, percentile 0.407440000 (date 2026-10-23)

Problem Types: CWE-395 | CWE-395 CWE-395 Use of NullPointerException Catch to Detect NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Xen Xen All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Xen Xen unknown consult Xen advisory XSA-472 Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2025/09/09/1 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
xenbits.xen.org/xsa/advisory-472.html af854a3a-2127-422b-91ae-364da2661108 xenbits.xen.org
xenbits.xenproject.org/xsa/advisory-472.html [email protected] xenbits.xenproject.org Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: This issue was discovered by Roger Pau Monné of XenServer. (en)

Additional Advisory Data

Workarounds

CNA: Not enabling the reference_tsc and stimer viridian extensions will avoid the issues.

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