x86 HVM I/O port list traversal_CVE-2026-42487

7.9 / 10

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

Description

HVM guest I/O port accesses are subject to either emulation or at least
translation. Translations are managed by the device model (via
XEN_DOMCTL_ioport_mapping), and hence the linked list used may changed
at any time. Traversal of those lists (while handling guest I/O port
accesses) therefore needs synchronizing with updates, which was missing
so far.

Basic Information

ID CVE-2026-42487

Source XEN

Published Jun 18, 2026 at 13:46

Modified Jun 18, 2026 at 15:07

Affected Product

Vendor Xen

Product Xen

Version consult Xen advisory XSA-491

CWE Classification

CWE-362

References

xenbits.xenproject.org /xsa/advisory-491.html

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    "published": "2026-06-18T13:46:53.459Z",
    "modified": "2026-06-18T15:07:31.335Z",
    "type": "cve",
    "title": "x86 HVM I/O port list traversal",
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