CVE-2026-42487 — x86 HVM I/O port list traversal
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…
Published: 2026-06-18 · CVSS: 7.9 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7