CVE-2026-42487

Published: Jun 18, 2026Modified: Jun 22, 2026Deferred

7.9

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

Exploitability: 2.0 / Impact: 5.3

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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.

Related CWEs

CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

References (3)

https://xenbits.xenproject.org/xsa/advisory-491.html

Source: security@xen.org

http://www.openwall.com/lists/oss-security/2026/06/09/11

Source: af854a3a-2127-422b-91ae-364da2661108

http://xenbits.xen.org/xsa/advisory-491.html

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.