Intel TDX MigTD: Confused deputy in signing enables privilege escalation
Summary
The MigTD component of Intel TDX, running in Ring 0, contains an unintended proxy (confused deputy) flaw in its signing function. A local attacker with privileged access on the system software side, using a low-complexity attack and no user interaction, may escalate privileges. The CVSS vector implies high integrity impact and high subsequent confidentiality impact. The Intel advisory excerpt provided does not list this CVE, so the affected scope is not confirmed.
Affected
Unknown.
- The CVE data does not name affected versions.
- The Intel advisory excerpt provided (INTEL-SA-01580) does not list CVE-2026-56432.
Fixed in
Unknown.
Workaround
Unknown.
Exploitation
No known exploitation. No public proof of concept or CISA KEV entry was found at the time of research.
Our recommendation
- Check whether any hosts run Intel TDX with MigTD live migration, including through a hosting or cloud provider.
- Open Intel advisory INTEL-SA-01580 and confirm whether CVE-2026-56432 is covered, along with affected and fixed versions.
- Once confirmed, apply the Intel reference software updates.
- Restrict privileged access on TDX hosts.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Intel SA-01580 advisory intel.com
- Intel MigTD GitHub repository github.com
- Intel TDX Module 1.5 TD Migration specification cdrdv2-public.intel.com
- Intel TDX Module TD Migration specification cdrdv2-public.intel.com
- Intel Trusted Computing Base Recovery Attestation 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 10 Nov 2026, 19:31.
Original description (NVD)
Unintended proxy or intermediary ('confused deputy') in the MigTD signing 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 escalation of privilege. 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 (high), integrity (high) 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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