CVE-2026-62431
Received Received - Intake

Division by Zero in Xen Hypervisor Viridian STIMER

Publication date: 2026-07-28

Last updated on: 2026-07-28

Assigner: Xen Project

Description
The logic to handle periodic Viridian STIMERs performs a division with an unchecked user-controlled divisor value, that can be set to zero to cause a #DE fault.

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Meta Information

Published
2026-07-28
Last Modified
2026-07-28
Generated
2026-07-28
AI Q&A
2026-07-28
EPSS Evaluated
N/A
NVD
CVE-2026-62431
EUVD
EUVD-2026-49784

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
xen xen From 4.13.0 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

CVE-2026-62431 is a vulnerability in Xen's Viridian STIMER handling logic where a user-controlled divisor is not properly checked. If set to zero, it causes a division by zero fault leading to a Denial of Service (DoS) affecting the entire host.

Detection Guidance

Detection involves checking if Viridian STIMERs are enabled for HVM guests. Inspect Xen configuration files for 'viridian=1' settings in guest VM configurations. Use 'xl list -v' to view guest parameters and verify Viridian extensions status.

Impact Analysis

This vulnerability can cause a Denial of Service (DoS) on the entire host system. Only HVM guests with Viridian STIMERs enabled can trigger the issue, but it impacts all Xen versions from 4.13 onwards.

Compliance Impact

This vulnerability causes a Denial of Service (DoS) affecting the entire host system by exploiting a division by zero fault in Xen's Viridian STIMER component. While it does not directly impact data confidentiality or integrity, a DoS could disrupt services handling regulated data, potentially violating compliance requirements for availability under standards like GDPR or HIPAA.

Mitigation Strategies

Disable Viridian STIMERs for all HVM guests by setting 'viridian=0' in guest configurations. Apply the available patch from the Xen stable branch. Monitor Xen advisory updates for further guidance.

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