CVE-2025-30513: TDX Module Privilege Escalation Flaw

CVE-2025-30513 Overview

CVE-2025-30513 is a race condition vulnerability affecting Intel TDX (Trust Domain Extensions) Module operating within Ring 0 (Hypervisor level). This flaw enables privilege escalation through a timing-based attack that exploits concurrent access to shared resources within the hypervisor context. The vulnerability allows a privileged system software adversary to escalate privileges via local access with low attack complexity, potentially compromising both confidentiality and integrity of the affected system.

Critical Impact

A race condition in Intel TDX Module at the hypervisor level can allow privilege escalation, enabling attackers with existing elevated privileges to further compromise system confidentiality and integrity.

Affected Products

• Intel TDX Module (specific versions not disclosed)
• Systems utilizing Intel Trust Domain Extensions
• Hypervisor environments running affected TDX Module versions

Discovery Timeline

• 2026-02-10 - CVE-2025-30513 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2025-30513

Vulnerability Analysis

This vulnerability stems from a race condition (CWE-362) within the Intel TDX Module's hypervisor-level operations. Intel TDX is a hardware-based isolation technology designed to protect virtual machines (Trust Domains) from the hypervisor and other software. The race condition occurs when concurrent threads or processes access shared resources without proper synchronization, creating a window where an attacker can manipulate the execution flow.

The flaw requires local access and a privileged user context, indicating that exploitation targets scenarios where an attacker has already achieved elevated access within the virtualized environment. Despite requiring existing privileges, the attack complexity is low and does not require user interaction, making it particularly concerning for cloud and data center environments utilizing TDX for workload isolation.

The vulnerability impacts confidentiality and integrity at a high level while availability remains unaffected. This pattern suggests the flaw enables unauthorized read/write access to protected memory regions or allows manipulation of trust domain boundaries rather than causing system crashes.

Root Cause

The root cause is a race condition (CWE-362) in the Intel TDX Module's Ring 0 hypervisor code. Race conditions occur when the correct behavior of a system depends on the sequence or timing of uncontrollable events. In this case, the vulnerability arises from improper synchronization when handling concurrent operations within the TDX Module, allowing a time-of-check to time-of-use (TOCTOU) window that can be exploited to escalate privileges.

Attack Vector

The attack vector is local, requiring the adversary to have existing privileged access to the system. The exploitation flow involves:

1. An attacker with privileged user access identifies the vulnerable race condition window in the TDX Module
2. The attacker crafts concurrent operations designed to exploit the timing gap between security checks and resource usage
3. By winning the race condition, the attacker can manipulate execution flow or access protected resources
4. Successful exploitation results in privilege escalation within the hypervisor context

The vulnerability requires special internal knowledge of the TDX Module's operation, suggesting sophisticated attackers targeting specific deployment scenarios would be the primary threat actors.

Detection Methods for CVE-2025-30513

Indicators of Compromise

• Unusual system call patterns or timing anomalies from privileged processes targeting TDX Module interfaces
• Unexpected privilege escalation events within virtualized environments using Intel TDX
• Anomalous memory access patterns in Ring 0 hypervisor operations
• Signs of repeated concurrent access attempts to TDX Module resources from the same privileged context

Detection Strategies

• Monitor for suspicious timing patterns in hypervisor-level operations that may indicate race condition exploitation attempts
• Implement integrity monitoring for TDX Module configurations and trust domain boundaries
• Deploy behavioral analysis to detect unusual privilege escalation sequences within TDX-protected environments
• Review audit logs for patterns consistent with race condition exploitation, including rapid repeated access attempts

Monitoring Recommendations

• Enable detailed logging for Intel TDX Module operations and hypervisor events
• Monitor system integrity using hardware-based attestation mechanisms
• Implement real-time alerting for privilege escalation events in virtualized environments
• Correlate security events across trust domains to identify potential lateral movement post-exploitation

How to Mitigate CVE-2025-30513

Immediate Actions Required

• Review the Intel Security Advisory SA-01397 for specific affected versions and remediation guidance
• Assess your environment for systems utilizing Intel TDX Module and prioritize patching
• Implement additional access controls to limit privileged access to TDX-enabled systems
• Monitor for exploitation attempts while patches are deployed

Patch Information

Intel has released security guidance for this vulnerability through Intel Security Advisory SA-01397. Organizations should consult this advisory for specific patch information, affected firmware versions, and update procedures for the Intel TDX Module.

Workarounds

• Restrict privileged access to systems running Intel TDX Module to only essential personnel and processes
• Implement strict network segmentation to limit local access vectors to affected systems
• Deploy additional monitoring and alerting for TDX Module operations until patches can be applied
• Consider temporarily disabling TDX functionality in non-critical environments if the risk is deemed unacceptable