Bug 2490341 (CVE-2026-42488)

Summary:	CVE-2026-42488 xen: x86: mismatched mapcache metadata
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:	2490538
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Description OSIDB Bzimport 2026-06-18 15:01:44 UTC

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.