CVE-2026-42487
x86 HVM I/O port list traversal
7.9CVSSHIGH
Description
HVM guest I/O port accesses are subject to either emulation or at least translation. Translations are managed by the device model (via XEN_DOMCTL_ioport_mapping), and hence the linked list used may changed at any time. Traversal of those lists (while handling guest I/O port accesses) therefore needs synchronizing with updates, which was missing so far.
CVSS Vector Breakdown
Exploitability
AV:LAttack VectorLocal
AC:LAttack ComplexityLow
PR:LPrivileges RequiredLow
UI:NUser InteractionNone
Scope
S:CScopeChanged
Impact
C:LConfidentialityLow
I:LIntegrityLow
A:HAvailabilityHigh
Weaknesses
Affected Products
Attack Graph
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Exploitability
Workaround Available
MITRE ATT&CK
1 technique Privilege Escalation
References
Timeline
Published
Jun 18, 2026
Last Updated
Jun 22, 2026
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