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Vulnerability record · CVE-2026-42488 · published 18 June 2026

CVE-2026-42488: Memory buffer overflow vulnerability

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

8.1 CVSS 3.1 High EPSS 0.55% · top 56.2% CWE-119 · Memory buffer overflow Deferred
8.1CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
22 Jun 2026Last modified by NVD

Description

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

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

References

LinkTags
https://xenbits.xenproject.org/xsa/advisory-494.html
http://www.openwall.com/lists/oss-security/2026/06/09/14
http://xenbits.xen.org/xsa/advisory-494.html

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Source: NIST National Vulnerability Database (record CVE-2026-42488), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.