CVE-2026-42487
High
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.
SeverityHigh
CVSS7.9
Exploit probability—
ProductHVM guest
PublishedJun 18, 2026
First seenJun 18, 2026
Weakness typeCWE-362Race condition
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Xen HVM guest | No range specified | — |
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