CVE-2026-42488
x86: mismatched mapcache metadata
8.1CVSSHIGH
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 Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:HConfidentialityHigh
I:HIntegrityHigh
A:HAvailabilityHigh
Weaknesses
Affected Products
Attack Graph
Products CVE Techniques Tactics
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Exploitability
Workaround Available
MITRE ATT&CK
2 techniques Initial Access
Privilege Escalation
References
Timeline
Published
Jun 18, 2026
Last Updated
Jun 22, 2026
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