Xen Project CMOS Memory Access out-of-bounds

Summaryinfo

A vulnerability classified as critical was found in Xen Project Xen. Affected is an unknown function of the component CMOS Memory Access. Executing a manipulation can lead to out-of-bounds. This vulnerability is handled as CVE-2026-62430. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Xen Project Xen (version unknown). It has been declared as critical. This vulnerability affects an unknown function of the component CMOS Memory Access. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at xenbits.xenproject.org. This vulnerability was named CVE-2026-62430 since 07/14/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/03/2026).

The vulnerability scanner Nessus provides a plugin with the ID 331597 (Fedora 44 : xen (2026-bf1da84dfc)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (331597) and CERT Bund (WID-SEC-2026-2568). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Open Source Xen

Productinfo

Type

• Project Management Software

Vendor

• Xen Project

Name

• Xen

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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