CVE-2026-42487

HVM guest I/O port accesses are subject to either emulation or at least translation. Translations are managed by the device model via XENDOMCTLioportmapping, and hence the linked list used may changed at any time. Traversal of those lists while handling guest I/O port accesses therefore needs...

CVE-2026-42487

The Xen hypervisor is vulnerable to an x86 HVM I/O port list traversal issue (XSA-491 ). The root cause is a lack of synchronization during the traversal of linked lists used for guest I/O port translations, which are managed by the device model via XEN_DOMCTL_ioport_mapping and can change at any...