CVE-2026-62431 Details
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.
A division by zero vulnerability has been identified in the handling of periodic Viridian STIMERs in Xen. This issue arises because the logic performs a division with an unchecked user-controlled divisor, which can be manipulated to zero, leading to a #DE fault. All Xen versions from 4.13 onwards are vulnerable, but versions 4.12 and earlier are not. The vulnerability can be exploited by HVM guests with Viridian STIMERs enabled, causing a denial-of-service condition that affects the entire host.
To address this vulnerability, apply the provided patch. For released versions, patches are generally prepared for the stable branches. It is recommended to update to the tip of the stable branch before applying the patch. For version 4.17.x, the patch is available as 'xsa504.patch'.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 28, 2026CISA-ADP
Assessed Jul 28, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| http://www.openwall.com/lists/oss-security/2026/07/28/20 | CVE | |
| http://xenbits.xen.org/xsa/advisory-504.html | CVE | |
| https://xenbits.xenproject.org/xsa/advisory-504.html | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-369 | Divide By Zero | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| Xen | >= 4.13 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 28, 2026 | CVE Modified | CVE |
| Jul 28, 2026 | CVE Modified | CISA-ADP |
| Jul 28, 2026 | CVE Modified | CVE |
| Jul 28, 2026 | New CVE Received | [email protected] |