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CVE-2026-42487 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CNA: CISA-ADPCVSS-B:7.9 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://www.openwall.com/lists/oss-security/2026/06/09/11	CVE	AdvisoryMailing ListRemedy
http://xenbits.xen.org/xsa/advisory-491.html	CVE	AdvisoryRemedyVendor
https://xenbits.xenproject.org/xsa/advisory-491.html	[email protected]	AdvisoryRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-362	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')	CISA-ADP

Affected Products

Product	Versions
Xen	>= 3.2
CPE cpe:2.3:o:xen:xen::::::x86::* cpe:2.3:o:xen:xen:::::::: cpe:2.3:a:xen:xen:::::::: Remediation Patch: xsa491.patchmoderate effort Patch: xsa491-4.21.patchmoderate effort Mitigation:low effort Run only PV or PVH guests.

Change History

3 change records found show changes

Date	Action	Recorded By
Jun 18, 2026	CVE Modified	CISA-ADP
Jun 18, 2026	CVE Modified	CVE
Jun 18, 2026	New CVE Received	[email protected]