Intel Hypervisor PCI BAR input validation

Summaryinfo

A vulnerability was found in Intel Hypervisor. It has been classified as problematic. This affects an unknown part of the component PCI BAR Handler. This manipulation causes input validation. This vulnerability appears as CVE-2026-56759. The attack requires local access. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic was found in Intel Hypervisor (unknown version). Affected by this vulnerability is an unknown code block of the component PCI BAR Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect integrity. The summary by CVE is:

Improper input validation in the MigTD PCI BAR handling for the Intel(R) TDX Migration Trust Domain (MigTD) within Ring 0: Hypervisor may allow an escalation of privilege. System software adversary with a privileged user combined with a low complexity attack may enable data corruption. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (high) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

It is possible to read the advisory at intel.com. This vulnerability is known as CVE-2026-56759 since 07/15/2026. The exploitation appears to be easy. Attacking locally is a requirement. Additional levels of successful authentication are necessary for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/10/2026).

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

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Productinfo

Vendor

• Intel

Name

• Hypervisor

License

• commercial

Website

• Vendor: https://www.intel.com/

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