CVE-2025-47389: Qualcomm AR8035 Buffer Overflow Flaw

CVE-2025-47389 Overview

CVE-2025-47389 is a memory corruption vulnerability affecting a wide range of Qualcomm chipsets and firmware components. The vulnerability occurs when a buffer copy operation fails due to an integer overflow during attestation report generation. This flaw, classified as CWE-120 (Buffer Copy without Checking Size of Input), allows a local attacker with low privileges to potentially achieve code execution, data corruption, or system compromise on affected devices.

The vulnerability impacts an extensive portfolio of Qualcomm products, including Snapdragon mobile platforms, 5G modem-RF systems, automotive chipsets, IoT platforms, and audio/wireless connectivity components. Given the widespread deployment of these chipsets across smartphones, vehicles, wearables, and embedded systems, the potential attack surface is significant.

Critical Impact

Local exploitation could allow attackers to corrupt memory and potentially achieve arbitrary code execution with elevated privileges on affected Qualcomm-based devices.

Affected Products

• Qualcomm Snapdragon 8 Elite, Snapdragon 8 Gen 3 Mobile Platform, and Snapdragon 888 5G Mobile Platform
• Qualcomm Snapdragon X55/X72/X75 5G Modem-RF Systems
• Qualcomm FastConnect 6200/6700/6800/6900/7800 Connectivity Chipsets
• Qualcomm SA8155P/SA8195P/SA8255P/SA8295P Automotive Platforms
• Qualcomm WCD9335/WCD9340/WCD9370/WCD9380/WCD9390 Audio Codecs
• Qualcomm WCN3910/WCN3950/WCN6450/WCN6650/WCN7860 Wireless Connectivity Chipsets
• Qualcomm Robotics RB2 Platform and Video Collaboration VC1/VC3 Platforms
• Qualcomm QCA6174A/QCA6574/QCA6696/QCA8337 Networking Chipsets

Discovery Timeline

• April 6, 2026 - CVE-2025-47389 published to NVD
• April 8, 2026 - Last updated in NVD database

Technical Details for CVE-2025-47389

Vulnerability Analysis

This vulnerability stems from improper handling of buffer sizes during attestation report generation within Qualcomm firmware. When generating attestation reports, the firmware performs a buffer copy operation that fails to properly validate the size of the input data against the destination buffer capacity. An integer overflow condition can occur during size calculations, causing the firmware to miscalculate the required buffer size.

When the integer overflow occurs, the calculated buffer size wraps around to a smaller value than actually needed. This results in a buffer that is too small to hold the data being copied, leading to memory corruption as data is written beyond the allocated buffer boundaries. The vulnerability requires local access to trigger and can be exploited by an attacker with low privileges on the system.

Successful exploitation could allow an attacker to overwrite adjacent memory regions, potentially corrupting critical data structures, function pointers, or control flow data. This could lead to arbitrary code execution with the privileges of the affected firmware component, which often operates at a highly privileged level within the system.

Root Cause

The root cause of CVE-2025-47389 is the absence of proper bounds checking when copying data into a buffer during attestation report generation. The code performs arithmetic operations on size values without validating that the result does not overflow the integer data type. When processing specially crafted input that triggers the overflow condition, the firmware allocates an insufficiently sized buffer and subsequently writes data beyond its bounds.

This is a classic CWE-120 (Buffer Copy without Checking Size of Input) vulnerability where the code trusts input size parameters without proper validation, combined with an integer overflow that defeats any implicit size assumptions.

Attack Vector

The attack vector for this vulnerability is local, meaning an attacker must have some level of access to the target device. The attack can be executed with low privileges and does not require user interaction. An attacker could potentially exploit this vulnerability through:

A malicious application running on an affected device could invoke the attestation report generation functionality with specially crafted parameters designed to trigger the integer overflow condition. On automotive or IoT platforms, exploitation might occur through compromised peripheral components or debug interfaces. The attestation subsystem is typically involved in secure boot and trust verification processes, making it an attractive target for attackers seeking persistent access or privilege escalation.

Detection Methods for CVE-2025-47389

Indicators of Compromise

• Unexpected system crashes or reboots during firmware attestation operations
• Memory corruption errors or kernel panics related to secure world or TrustZone components
• Anomalous behavior in device attestation or integrity verification processes
• Unusual memory allocation patterns in firmware-level logging

Detection Strategies

• Monitor system logs for attestation-related errors or unexpected failures in secure enclave operations
• Implement firmware integrity monitoring to detect unauthorized modifications resulting from exploitation
• Deploy endpoint detection solutions capable of monitoring low-level firmware and TrustZone activity
• Utilize hardware security modules or secure boot verification to detect compromise of attestation functionality

Monitoring Recommendations

• Enable verbose logging for attestation and secure boot processes where supported by the platform
• Monitor for unexpected modifications to firmware partitions or secure storage areas
• Implement continuous integrity verification for critical firmware components
• Configure alerts for repeated attestation failures which may indicate exploitation attempts

How to Mitigate CVE-2025-47389

Immediate Actions Required

• Review device inventory to identify all systems using affected Qualcomm chipsets
• Prioritize patching for devices handling sensitive data or operating in high-risk environments
• Apply firmware updates from device manufacturers as they become available
• Implement network segmentation to limit exposure of potentially vulnerable devices

Patch Information

Qualcomm has addressed this vulnerability in their April 2026 Security Bulletin. Device manufacturers using affected Qualcomm chipsets should integrate the security patches into their firmware updates. End users should apply firmware updates from their device manufacturers (OEMs) as they become available through standard update channels.

For enterprise environments, coordinate with mobile device management (MDM) solutions to ensure timely deployment of patched firmware across managed device fleets. Automotive and IoT deployments may require coordination with system integrators for firmware update scheduling.

Workarounds

• Limit physical and local access to affected devices to reduce exploitation opportunities
• Disable or restrict access to attestation functionality if not required for device operation (where supported)
• Implement application-level access controls to prevent untrusted applications from invoking attestation services
• Monitor affected devices for anomalous behavior until patches can be applied

# Example: Check for Qualcomm chipset on Android devices
# This can help identify potentially affected devices in your environment
adb shell getprop ro.board.platform
adb shell getprop ro.hardware

# Verify current firmware/security patch level
adb shell getprop ro.build.version.security_patch