x86: mismatched mapcache metadata

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Summary

CVECVE-2026-42488
StatePUBLISHED
AssignerXEN
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-18 14:17:25 UTC
Updated2026-06-18 16:16:53 UTC
DescriptionSome 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from ADP

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

Problem Types: CWE-119 | CWE-119 CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Xen Xen unknown consult Xen advisory XSA-494 Not specified

References

ReferenceSourceLinkTags
xenbits.xenproject.org/xsa/advisory-494.html [email protected] xenbits.xenproject.org
www.openwall.com/lists/oss-security/2026/06/09/14 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
xenbits.xen.org/xsa/advisory-494.html af854a3a-2127-422b-91ae-364da2661108 xenbits.xen.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: This issue was discovered by Roger Pau Monné of XenServer. (en)

Additional Advisory Data

Workarounds

CNA: Running only HVM or PVH guests will avoid the vulnerability. Running PV guests in the PV shim will also avoid the vulnerability.

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