CVE-2026-42487

x86 HVM I/O port list traversal

High · published June 18, 2026

CVSS v3.1
7.9
EPSS
0%
Percentile
0.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.9 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
CVSS v4.0
Not supplied
EPSS
0.00095 · 0.6th percentile
Published
2026-06-18T13:46Z
EPSS history
Timeline
  • 18 JUN 13:46Z
    x86 HVM I/O port list traversal
    cvelistv5