CVE-2026-79602

x86: improper handling of HVM emulation return codes

Published Sep 8, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
A guest with a PCI device assigned that has at least a BAR on the IO port
space can trigger a BUG() in Xen.

Remediation

Vendor Workaround

There is no mitigation available.

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4818-1 xen security update
Debian DLA Debian DLA DLA-4881-1 xen security update
Debian DSA Debian DSA DSA-6571-1 xen security update
History
Type Values Removed Values Added
Weaknesses CWE-252
Type Values Removed Values Added
Weaknesses CWE-119
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Xen
Xen xen
Vendors & Products Xen
Xen xen
Type Values Removed Values Added
Weaknesses CWE-252
Type Values Removed Values Added
Description A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen.
Title x86: improper handling of HVM emulation return codes
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
XEN
Published
Updated
Sep 10, 2026, 6:08 PM
Reserved
Aug 25, 2026, 7:35 AM
Status
Awaiting Analysis
Published
Sep 8, 2026, 1:17 PM
Modified
Sep 10, 2026, 7:17 PM