CVE-2025-47339: Qualcomm Fastconnect 6900 Use-After-Free

CVE-2025-47339 Overview

CVE-2025-47339 is a memory corruption vulnerability in Qualcomm firmware components affecting a broad range of Snapdragon mobile, automotive, compute, and connectivity platforms. The flaw occurs during the deinitialization of a High-bandwidth Digital Content Protection (HDCP) session and is classified as a Use-After-Free condition [CWE-416]. A local, authenticated attacker with low privileges can trigger the flaw to corrupt memory, potentially leading to code execution in a privileged context. Qualcomm disclosed the issue in its January 2026 security bulletin.

Critical Impact
Local exploitation of the HDCP session deinitialization path can result in memory corruption, enabling privilege escalation and full compromise of confidentiality, integrity, and availability on affected Snapdragon platforms.

Affected Products

Qualcomm Snapdragon mobile platforms (Snapdragon 4 Gen 2, 6 Gen 1, 8 Gen 3, and related SM-series SoCs)
Qualcomm automotive and compute platforms (SA8155P, SA8295P, SA8775P, SC8380XP, QCS9100, and related SA/QCS/QAM SKUs)
Qualcomm connectivity and networking firmware (FastConnect 6200/6700/6900/7800, IPQ, QCA, QCN, and WCN/WCD/WSA family firmware)

Discovery Timeline

2026-01-07 - CVE-2025-47339 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-47339

Vulnerability Analysis

The vulnerability resides in the HDCP session management logic implemented in Qualcomm firmware. HDCP is used to protect protected content over display interfaces, and its session lifecycle includes initialization, key exchange, and deinitialization. During the deinitialization path, the firmware mishandles memory associated with the session state, producing a use-after-free condition tracked as [CWE-416].

An attacker who can invoke the HDCP tear-down flow from a local, low-privileged context can force the affected component to operate on stale references. Because the vulnerable code runs inside privileged firmware, a successful trigger can corrupt structures that influence control flow or sensitive data. The result is a high-impact local vulnerability across mobile, automotive, XR, and networking silicon.

Root Cause

The root cause is improper lifetime management of memory tied to an HDCP session object. When the session is deinitialized, references to freed memory remain reachable and are dereferenced or written to during subsequent cleanup or callback operations. This dangling reference constitutes the use-after-free condition described by [CWE-416].

Attack Vector

Exploitation requires local access with low privileges and no user interaction. An attacker running code on the device (for example, a compromised application or a driver-adjacent process able to reach the HDCP interface) can drive session lifecycle transitions that reach the vulnerable deinitialization path. No network vector is required.

No verified public exploit or proof-of-concept has been published, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog. Technical details of the vulnerable code path are described in prose because no verified exploit code is available; see the Qualcomm January 2026 Security Bulletin for vendor-authoritative information.

Detection Methods for CVE-2025-47339

Indicators of Compromise

Unexpected crashes, kernel panics, or firmware watchdog resets referencing HDCP or display subsystem components.
Repeated tear-down and re-initialization of HDCP sessions from a single non-privileged process.
Post-crash diagnostic logs showing faults during HDCP session cleanup functions in Qualcomm display or DRM drivers.

Detection Strategies

Monitor endpoint telemetry from mobile device management (MDM) and automotive fleet tools for abnormal frequency of display driver faults on affected Snapdragon SKUs.
Correlate application-layer activity that interacts with protected content APIs against subsequent firmware or driver crash events.
Track firmware and Android security patch level (SPL) across the fleet to identify devices missing the January 2026 Qualcomm patch.

Monitoring Recommendations

Ingest device crash reports and kernel logs into a central data lake for longitudinal analysis of HDCP-related faults.
Alert on privilege escalation indicators on Snapdragon-based endpoints, including unexpected changes to system properties or SELinux domain transitions after display subsystem crashes.
Baseline normal HDCP session activity on devices that render DRM-protected media and flag statistically anomalous session churn.

How to Mitigate CVE-2025-47339

Immediate Actions Required

Inventory all Qualcomm-based devices in scope, including Snapdragon mobile handsets, automotive head units, XR devices, and Qualcomm-based network appliances.
Apply firmware updates from device OEMs incorporating the fixes described in the Qualcomm January 2026 Security Bulletin as soon as they are released for each product line.
Restrict installation of untrusted applications on affected mobile and automotive endpoints until patches are deployed.

Patch Information

Qualcomm has published fixes for CVE-2025-47339 in the January 2026 security bulletin. Downstream OEMs (mobile handset vendors, automotive integrators, and networking equipment manufacturers) must integrate the corrected firmware into their own release trains. Track OEM advisories for the corresponding Android Security Patch Level or firmware build that includes this fix.

Workarounds

Enforce MDM policies that block sideloading and restrict application sources on affected handsets and automotive infotainment systems.
Limit exposure to untrusted protected-content workflows on unpatched devices, reducing opportunities to reach the HDCP session deinitialization path.
Prioritize patching for high-value roles and privileged users whose devices process sensitive data on vulnerable Snapdragon platforms.

bash

# Example: verify Android Security Patch Level on an affected handset
adb shell getprop ro.build.version.security_patch

# Example: enumerate Qualcomm firmware components present on device
adb shell ls /vendor/firmware/ | grep -Ei 'hdcp|display|qcom'