Vulnerability DatabaseCVE-2026-42488
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CVE-2026-42488
Published:June 18, 2026
Updated:August 06, 2026
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.
Affected Packages
https://github.com/xen-project/xen.git (GITHUB):
Affected version(s) >=RELEASE-4.19.0 <RELEASE-4.19.5
Fix Suggestion:
Update to version RELEASE-4.19.5
https://github.com/xen-project/xen.git (GITHUB):
Affected version(s) >=RELEASE-4.20.0 <RELEASE-4.20.3
Fix Suggestion:
Update to version RELEASE-4.20.3
https://github.com/xen-project/xen.git (GITHUB):
Affected version(s) =RELEASE-4.21.0 <RELEASE-4.21.1
Fix Suggestion:
Update to version RELEASE-4.21.1
Related Resources (3)
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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CVSS v4
Base Score:
9.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-119
EPSS
Base Score:
0.35