CVE-2026-42488

HIGH 8.1

x86: mismatched mapcache metadata

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	xen
Product	xen
Published	Jun 18, 2026
Last Updated	Jun 18, 2026

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Affected Versions

Xen / Xen

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

This issue was discovered by Roger Pau Monné of XenServer.