CVE-2025-47366: Trusted Zone Information Disclosure Flaw

CVE-2025-47366 Overview

CVE-2025-47366 is a cryptographic vulnerability affecting Qualcomm's Trusted Zone implementation. The flaw occurs when a Trusted Zone running outdated code is triggered by a High-Level Operating System (HLOS) providing incorrect input, potentially compromising the security guarantees of the trusted execution environment.

Critical Impact

This vulnerability enables local attackers with low privileges to compromise cryptographic operations within the Trusted Zone, potentially leading to high-impact confidentiality and integrity breaches on affected devices.

Affected Products

• Qualcomm chipsets with Trusted Zone implementations (specific models listed in vendor bulletin)
• Devices running affected firmware versions
• Systems with outdated Trusted Zone code

Discovery Timeline

• 2026-02-02 - CVE-2025-47366 published to NVD
• 2026-02-03 - Last updated in NVD database

Technical Details for CVE-2025-47366

Vulnerability Analysis

This vulnerability is classified under CWE-749 (Exposed Dangerous Method or Function), indicating that the Trusted Zone exposes functionality that can be abused when provided with malformed or unexpected input from the HLOS. The attack requires local access to the device and low-level privileges, but does not require user interaction to exploit.

The cryptographic issue stems from improper handling of input validation within the Trusted Zone's secure processing routines. When the HLOS provides incorrect input to trigger operations in a Trusted Zone containing outdated cryptographic code, the security boundaries that normally protect sensitive operations can be circumvented.

Root Cause

The root cause involves the exposure of a dangerous method or function (CWE-749) within the Trusted Zone architecture. When outdated code exists in the Trusted Zone and receives improperly formatted input from the HLOS, the cryptographic operations fail to properly validate or handle the malicious input, creating a path for exploitation.

This represents a failure in the trust boundary between the normal world (HLOS) and the secure world (Trusted Zone), where the secure side inappropriately trusts input from the less privileged environment.

Attack Vector

The attack requires local access to the target device. An attacker with low-level privileges on the HLOS can craft malicious input designed to trigger the vulnerable code path in the Trusted Zone. By exploiting the improper input handling in outdated Trusted Zone code, the attacker can potentially:

1. Access sensitive cryptographic material protected by the Trusted Zone
2. Manipulate cryptographic operations to produce predictable or compromised outputs
3. Bypass security controls that depend on the integrity of Trusted Zone operations

The vulnerability does not affect system availability, focusing instead on compromising confidentiality and integrity of protected data.

Detection Methods for CVE-2025-47366

Indicators of Compromise

• Unexpected or anomalous system calls targeting Trusted Zone interfaces
• Unusual patterns of communication between HLOS and secure world components
• Evidence of attempts to pass malformed data to Trusted Zone entry points

Detection Strategies

• Monitor system logs for failed or suspicious Trusted Zone operations
• Implement behavioral analysis to detect unusual access patterns to secure world interfaces
• Review firmware version information to identify devices running outdated Trusted Zone code

Monitoring Recommendations

• Enable logging for all Trusted Zone interactions where possible
• Deploy endpoint detection solutions capable of monitoring low-level system behavior
• Establish baseline behavior for normal HLOS-to-Trusted Zone communication patterns

How to Mitigate CVE-2025-47366

Immediate Actions Required

• Review the Qualcomm Security Bulletin February 2026 for specific affected components
• Inventory all devices using Qualcomm chipsets to identify potentially vulnerable systems
• Prioritize firmware updates for devices in high-security environments
• Implement access controls to limit which applications can interact with Trusted Zone interfaces

Patch Information

Qualcomm has addressed this vulnerability in their February 2026 security bulletin. Device manufacturers and OEMs should obtain the updated firmware from Qualcomm and distribute patches to end users through their standard update mechanisms. End users should ensure their devices are updated to the latest available firmware version.

For detailed patch information, refer to the Qualcomm Security Bulletin February 2026.

Workarounds

• Restrict physical access to affected devices until patches can be applied
• Limit application permissions to reduce the attack surface for local exploitation
• Where possible, disable or restrict access to Trusted Zone interfaces from untrusted applications
• Monitor for and remove any suspicious applications that may attempt to exploit this vulnerability