CVE-2025-47400: Qualcomm Pandeiro Buffer Overflow Flaw

CVE-2025-47400 Overview

CVE-2025-47400 is a cryptographic vulnerability affecting multiple Qualcomm chipset firmware products. The flaw involves copying data to a destination buffer without properly validating its size, classified as CWE-126 (Buffer Over-read). This vulnerability allows a local attacker with low privileges to potentially read sensitive data beyond intended buffer boundaries, compromising the confidentiality and integrity of cryptographic operations on affected devices.

Critical Impact

Local attackers can exploit improper buffer size validation in cryptographic operations to read sensitive memory contents and potentially compromise data integrity on affected Qualcomm chipsets including Snapdragon 8 Elite Gen 5 and various wireless components.

Affected Products

• Qualcomm Snapdragon 8 Elite Gen 5 Firmware
• Qualcomm Pandeiro Firmware
• Qualcomm SW6100/SW6100P Firmware
• Qualcomm Themisto Firmware
• Qualcomm WCD9395 Audio Codec Firmware
• Qualcomm WCN7860/WCN7861 Wi-Fi Firmware
• Qualcomm WSA8840/WSA8845/WSA8845H Smart Amplifier Firmware

Discovery Timeline

• April 6, 2026 - CVE-2025-47400 published to NVD
• April 8, 2026 - Last updated in NVD database

Technical Details for CVE-2025-47400

Vulnerability Analysis

This vulnerability stems from insufficient size validation when copying data to destination buffers during cryptographic operations. The buffer over-read condition (CWE-126) occurs when the affected firmware code reads data past the allocated buffer boundary, potentially exposing sensitive cryptographic material or other security-critical information stored in adjacent memory regions.

The attack requires local access to the device and low-level privileges, meaning an attacker would need to have already established a foothold on the target system. While user interaction is not required to trigger the vulnerability, the local access requirement limits the attack surface compared to remotely exploitable vulnerabilities.

The impact centers on confidentiality and integrity compromise without affecting system availability. Attackers successfully exploiting this vulnerability could extract cryptographic keys, session tokens, or other sensitive data processed by the affected chipset firmware.

Root Cause

The root cause is improper input validation when handling buffer operations within the cryptographic subsystem. The firmware fails to validate that the destination buffer has sufficient capacity before initiating copy operations, leading to out-of-bounds read conditions. This type of vulnerability commonly arises from:

• Missing boundary checks before memory copy operations
• Incorrect calculation of buffer sizes during cryptographic data processing
• Assumptions about input data lengths that may not hold in adversarial scenarios

Attack Vector

The vulnerability requires local access to exploit (Attack Vector: Local). An authenticated local attacker with low privileges can craft malicious input to trigger the buffer over-read condition during cryptographic operations. The attack complexity is low, requiring no user interaction.

Exploitation typically involves:

1. Gaining local access to a device running vulnerable Qualcomm firmware
2. Invoking cryptographic functions with specially crafted parameters
3. Triggering the buffer over-read to leak sensitive memory contents
4. Extracting confidential data such as cryptographic keys or session information

The vulnerability mechanism involves improper bounds checking when copying data to destination buffers during cryptographic processing. For complete technical details, refer to the Qualcomm Security Bulletin April 2026.

Detection Methods for CVE-2025-47400

Indicators of Compromise

• Unusual memory access patterns in cryptographic subsystem logs
• Unexpected read operations accessing memory regions adjacent to cryptographic buffers
• Anomalous firmware behavior during cryptographic operations on affected chipsets
• Evidence of local privilege escalation attempts targeting firmware components

Detection Strategies

• Implement runtime memory access monitoring for cryptographic operations on affected Qualcomm hardware
• Deploy endpoint detection solutions capable of identifying abnormal buffer access patterns
• Monitor for exploitation attempts through kernel and firmware-level logging mechanisms
• Utilize hardware-assisted security features to detect out-of-bounds memory access

Monitoring Recommendations

• Enable verbose logging for cryptographic operations on devices with affected Qualcomm chipsets
• Implement firmware integrity monitoring to detect potential exploitation artifacts
• Deploy SentinelOne agents on mobile devices and IoT systems running affected firmware to detect suspicious activity patterns
• Establish baseline behavior metrics for cryptographic subsystem operations to identify anomalies

How to Mitigate CVE-2025-47400

Immediate Actions Required

• Apply firmware updates from Qualcomm and device OEMs as they become available
• Inventory all devices containing affected Qualcomm chipsets to prioritize patching efforts
• Restrict local access to affected devices to minimize exploitation opportunity
• Monitor vendor security advisories for patch availability announcements

Patch Information

Qualcomm has published security information regarding this vulnerability in their April 2026 Security Bulletin. Organizations should:

1. Review the Qualcomm Security Bulletin April 2026 for detailed patch guidance
2. Contact device manufacturers (OEMs) for device-specific firmware updates
3. Coordinate with mobile device management (MDM) solutions to deploy updates across enterprise fleets
4. Prioritize devices running Snapdragon 8 Elite Gen 5 and other high-value targets

Workarounds

• Limit physical and local access to devices with affected Qualcomm chipsets
• Implement additional authentication layers for sensitive operations on affected devices
• Consider network segmentation for IoT devices running vulnerable firmware
• Enable any available security hardening features in device firmware settings pending patch deployment

For systems where firmware updates cannot be immediately applied, organizations should implement defense-in-depth strategies focusing on access control and monitoring to reduce exploitation risk until proper patches can be deployed.