CVE-2026-42487
HIGH
NVD
CVSS Score
7.9
Severity
HIGH
Published
Jun 18, 2026
Vendor
unknown
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.