CVE-2026-62430

Published: Jul 28, 2026Modified: Jul 28, 2026Deferred

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

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

Description

Accesses to the CMOS memory contents are done using an indirect IO port pair. Therefore Xen needs to cache the guest chosen index, and one of the usages of the index didn't take the necessary locking to avoid concurrent changes. As a result, a guest could change the index after it being checked, causing a subsequent out-of-bound read access to the contents of an array.

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-503.html

Source: security@xen.org

http://www.openwall.com/lists/oss-security/2026/07/28/19

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

http://xenbits.xen.org/xsa/advisory-503.html

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

Timeline

No history available yet.