CVE-2025-47329: Qualcomm Fastconnect Use After Free Flaw

CVE-2025-47329 Overview

CVE-2025-47329 is a memory corruption vulnerability affecting a broad range of Qualcomm firmware components. The flaw occurs during application info setup when the firmware handles invalid inputs. It is classified as [CWE-763] Release of Invalid Pointer or Reference and requires local access with low privileges to exploit.

Qualcomm disclosed the issue in its September 2025 security bulletin. Affected products span mobile, automotive, wearable, and connectivity chipsets, including the Snapdragon 8 Gen 3 Mobile Platform and FastConnect 7800.

Critical Impact
A local attacker with low privileges can trigger memory corruption in Qualcomm firmware, leading to loss of confidentiality, integrity, and availability on the affected device.

Affected Products

Qualcomm Snapdragon 8 Gen 3 Mobile Platform firmware
Qualcomm FastConnect 7800 firmware and multiple QCA/WCN/WSA/WCD connectivity chipsets
Qualcomm automotive (SA6155P, SA8155P, SA8195P, SA8255P, SA8770P, SA8775P, SA9000P) and wearable (Snapdragon W5+ Gen 1, SW5100, SW5100P) firmware

Discovery Timeline

2025-09-24 - CVE CVE-2025-47329 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-47329

Vulnerability Analysis

The vulnerability resides in the application info setup path within affected Qualcomm firmware. When the routine processes malformed or invalid inputs, it fails to correctly manage internal pointer state, resulting in memory corruption. The condition maps to [CWE-763], where the code releases or dereferences an invalid pointer or reference.

Exploitation requires a local vector and low privileges, meaning an attacker must already have code execution on the device, typically through a compromised application. No user interaction is needed. Successful exploitation can compromise the confidentiality, integrity, and availability of firmware-managed resources, potentially enabling privilege escalation into a more trusted execution context on the SoC.

Root Cause

The root cause is improper validation of inputs supplied to the application info setup logic. The firmware trusts caller-supplied data used to construct or reference application context structures. When these inputs deviate from expected shapes or sizes, the code operates on invalid pointer state, corrupting memory adjacent to the affected structure.

Attack Vector

A local attacker leverages an application or process with low privileges to send crafted inputs to the vulnerable interface exposed by firmware. Because Qualcomm firmware often runs in a privileged execution environment relative to the operating system, corrupting its memory can undermine higher-level security guarantees, including those enforced by the host OS kernel and its trust anchors.

No public proof-of-concept or exploit is currently available for CVE-2025-47329, and it is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2025-47329

Indicators of Compromise

Unexpected crashes, resets, or watchdog-triggered reboots involving Qualcomm firmware subsystems tied to Wi-Fi, Bluetooth, audio codec, or application processor initialization.
Kernel logs (dmesg, logcat) showing repeated faults from Qualcomm drivers interacting with the affected component during application setup.
Unauthorized applications repeatedly invoking privileged firmware interfaces with malformed parameters.

Detection Strategies

Inventory endpoints and IoT/mobile assets against the affected chipset list and flag any device without the September 2025 Qualcomm firmware update.
Monitor mobile device management (MDM) and endpoint telemetry for firmware version fingerprints and patch-level status.
Correlate crash telemetry with process attribution to identify low-privilege apps that trigger firmware faults.

Monitoring Recommendations

Enable and centrally collect crash and tombstone logs from mobile, automotive, and embedded devices using affected Qualcomm silicon.
Alert on abnormal invocation patterns of vendor HAL interfaces that interact with Wi-Fi, Bluetooth, and audio firmware.
Track OEM firmware bulletin adoption to confirm downstream vendors have integrated the Qualcomm September 2025 fix.

How to Mitigate CVE-2025-47329

Immediate Actions Required

Apply the firmware update referenced in the Qualcomm September 2025 security bulletin as soon as OEM builds are available.
Contact device OEMs (mobile, automotive, wearable, IoT) for the integrated patch schedule for each affected SKU.
Restrict installation of untrusted applications on devices built on the affected Qualcomm platforms until patches are deployed.

Patch Information

Qualcomm addressed CVE-2025-47329 in the Qualcomm Security Bulletin - September 2025. Device manufacturers must integrate the updated firmware into their release trains and push it to affected endpoints through OTA updates.

Workarounds

Enforce application allowlisting and disable sideloading on affected mobile and embedded devices to limit local attacker capability.
Apply least-privilege policies so untrusted apps cannot reach firmware interfaces exposed during application info setup.
Segment automotive and IoT devices on isolated networks to reduce the blast radius of local compromise pending firmware rollout.

bash

# Verify current firmware/build information on Android devices built on affected Qualcomm SoCs
adb shell getprop ro.build.version.security_patch
adb shell getprop ro.vendor.build.security_patch
adb shell getprop ro.boot.bootloader