Intel TDX Module improper authentication

Summaryinfo

A vulnerability classified as problematic has been found in Intel TDX Module. The affected element is an unknown function. The manipulation leads to improper authentication. This vulnerability is referenced as CVE-2026-20885. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in Intel TDX Module (version now known) and classified as problematic. This issue affects some unknown processing. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Improper authentication in the Intel(R) TDX module for some Intel(R) platforms within Ring 0: Trust Domain may allow an information disclosure and escalation of privilege. System software adversary with a privileged user combined with a high complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (low), integrity (low) and availability (none) impacts.

The advisory is shared at intel.com. The identification of this vulnerability is CVE-2026-20885 since 12/03/2025. The exploitation is known to be easy. An attack has to be approached locally. The exploitation requires an enhanced level of successful authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/11/2026).

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Intel

Name

• TDX Module

License

• commercial

Website

• Vendor: https://www.intel.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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