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Vulnerability record · CVE-2026-42487 · published 18 June 2026

CVE-2026-42487: Race condition vulnerability

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.

7.9 CVSS 3.1 High EPSS 0.12% · top 98.2% CWE-362 · Race condition Deferred
7.9CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
22 Jun 2026Last modified by NVD

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.

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

References

LinkTags
https://xenbits.xenproject.org/xsa/advisory-491.html
http://www.openwall.com/lists/oss-security/2026/06/09/11
http://xenbits.xen.org/xsa/advisory-491.html

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-42487), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.