CVE-2026-62430
High
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.
SeverityHigh
CVSS7.5
Exploit probability16. percentile0.2%
ProductXen
PublishedJul 28, 2026
First seenJul 28, 2026
Weakness typeCWE-362Race condition
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Xen | No range specified | — |
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