Intel TDX MigTD: Improper input validation in PCI BAR handling allows privilege escalation
Summary
The Intel TDX Migration Trust Domain (MigTD) component contains an improper input validation flaw in its PCI BAR handling, as stated in the CNA description. A local attacker with high privileges, such as a system software adversary, may escalate privileges from Ring 0 and corrupt data in the affected system. Exploitation requires no user interaction and no special internal knowledge, according to the vector given in the request; the realistic impact is integrity loss. Intel's CNA score is 6.7 (MEDIUM); NVD analysis is still pending.
Affected
- Intel TDX Migration Trust Domain (MigTD). Affected versions: Unknown. Refer to Intel advisory INTEL-SA-01580.
Fixed in
Unknown. Refer to Intel advisory INTEL-SA-01580 for reference software updates.
Workaround
Unknown. No vendor-confirmed mitigation found. General hardening: limit privileged and hypervisor-level access and monitor for unusual hypervisor behavior.
Exploitation
- No evidence of exploitation in the wild (not known to be exploited).
- No public proof-of-concept found.
- Not listed in CISA KEV as far as known.
Our recommendation
- Check whether any server, hosting provider or cloud platform in use runs Intel TDX; if not, no action is needed.
- Ask hosting or cloud providers for their patch status under INTEL-SA-01580.
- Apply firmware and software updates from the server vendor when released.
- Limit administrative and hypervisor-level access.
- Track the Intel advisory and NVD analysis for updates.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Intel Security Advisory INTEL-SA-01580 intel.com
- OffSeq Radar: CVE-2026-56759 overview radar.offseq.com
- OffSeq Radar: PCI BAR handling input validation radar.offseq.com
- Strix: CVE-2026-56759 www.strix.ai
- Intel Security Center www.intel.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 11:35.
Original description (NVD)
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.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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