CVE-2026-62431

Viridian STIMER division by zero

Published Jul 28, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

Not enabling Viridian STIMERs for HVM guests will avoid the vulnerability. Note Viridian extensions are not enabled by default.

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Debian DLA Debian DLA DLA-4818-1 xen security update
Debian DSA Debian DSA DSA-6424-1 xen security update
History
Type Values Removed Values Added
First Time appeared Xen
Xen xen
Vendors & Products Xen
Xen xen
Type Values Removed Values Added
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.
Title Viridian STIMER division by zero
Weaknesses CWE-369
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
XEN
Published
Updated
Jul 28, 2026, 4:33 PM
Reserved
Jul 14, 2026, 10:28 AM
Status
Deferred
Published
Jul 28, 2026, 1:19 PM
Modified
Jul 28, 2026, 5:16 PM