CVE-2026-62430

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.

• CWE-362

• https://xenbits.xenproject.org/xsa/advisory-503.html
• http://www.openwall.com/lists/oss-security/2026/07/28/19
• http://xenbits.xen.org/xsa/advisory-503.html

Published

Jul 28, 2026

Last Modified

Jul 28, 2026

Status

Deferred

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