Parts of the DM_OP handling code assumes the caller has provided the
required number of buffers for the given operation without any checking
being done. As a result, certain operations might access stack
rubble as structures are possibly uninitialized.

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Fixes

Solution

No solution given by the vendor.


Workaround

Running only PV or PVH guests will avoid the vulnerability. (Switching from a device model stub domain or a de-privileged device model to a fully privileged Dom0 device model does NOT mitigate this vulnerability. Rather, it simply recategorises the vulnerability to hostile management code, regarding it "as designed"; thus it merely reclassifies these issues as "not a bug". The security of a Xen system using stub domains is still better than with a qemu-dm running as a Dom0 process. Users and vendors of stub qemu dm systems should not change their configuration to use a Dom0 QEMU process.)

History

Tue, 28 Jul 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Xen
Xen xen
Vendors & Products Xen
Xen xen

Tue, 28 Jul 2026 16:15:00 +0000

Type Values Removed Values Added
Description Parts of the DM_OP handling code assumes the caller has provided the required number of buffers for the given operation without any checking being done. As a result, certain operations might access stack rubble as structures are possibly uninitialized.
Title correct buffer checks for DM_OP hypercalls
Weaknesses CWE-665
References
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'}

ssvc

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


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: XEN

Published:

Updated: 2026-07-28T16:33:33.573Z

Reserved: 2026-07-14T10:28:12.655Z

Link: CVE-2026-62433

cve-icon Vulnrichment

Updated: 2026-07-28T16:33:33.573Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-28T20:00:10Z

Weaknesses