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.
References (3)
Core 3
Core References
Various Sources
http://xenbits.xen.org/xsa/advisory-491.html
Scores
CVSS v3
7.9
EPSS
0.0009
EPSS Percentile
0.8%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-362
Status
published
Products (1)
Xen/Xen
consult Xen advisory XSA-491
Published
Jun 18, 2026
Tracked Since
Jun 18, 2026