CVE-2025-47356: Qualcomm Cologne Race Condition Flaw

CVE-2025-47356 Overview

CVE-2025-47356 is a memory corruption vulnerability affecting a broad range of Qualcomm firmware components, including audio codecs, wireless connectivity chips, and platform processors. The flaw is triggered when multiple threads concurrently access and modify shared resources without proper synchronization, leading to a double free condition [CWE-415]. An authenticated local attacker with low privileges can exploit the race window to corrupt heap memory, escalate privileges, or execute arbitrary code within the affected component.

Critical Impact
Successful exploitation compromises confidentiality, integrity, and availability of the affected Qualcomm firmware, enabling local privilege escalation on devices integrating vulnerable chipsets.

Affected Products

Qualcomm audio codecs: WCD9378C, WCD9380, WCD9385, WSA8840, WSA8845, WSA8845H
Qualcomm connectivity: FastConnect 6900, FastConnect 7800, QCA0000, Cologne
Qualcomm platform and modem firmware: SC8380XP, X2000077, X2000086, X2000090, X2000092, X2000094, XG101002, XG101032, XG101039

Discovery Timeline

2026-01-07 - CVE-2025-47356 published to the National Vulnerability Database
2026-01-07 - Qualcomm publishes the January 2026 Security Bulletin addressing the issue
2026-06-17 - Last updated in the NVD database

Technical Details for CVE-2025-47356

Vulnerability Analysis

The vulnerability is classified under [CWE-415: Double Free], stemming from insufficient synchronization when multiple execution contexts operate on shared firmware objects. When two threads reach a resource release path concurrently, both may pass the validity check before either has updated the pointer state. The result is that the same allocation is released more than once, corrupting heap metadata.

A double free primitive in embedded firmware is particularly dangerous because it can be steered into arbitrary write conditions. Attackers can groom the heap so a subsequent allocation returns an attacker-controlled address, enabling function pointer overwrites within the affected subsystem. Because the vulnerable code lives in tightly integrated firmware for audio, Wi-Fi, and modem processing, exploitation can pivot between security domains on the System-on-Chip.

Root Cause

The root cause is missing or incorrect locking around a shared resource lifecycle. The affected code path does not enforce mutual exclusion between the check that determines whether a resource is live and the free operation that releases it, creating a time-of-check to time-of-use window suitable for concurrent double free.

Attack Vector

Exploitation requires local access with low privileges and no user interaction. An attacker running code on the host processor triggers the vulnerable firmware interface from multiple threads simultaneously, racing to invoke the release path. On success, the corrupted heap state can be leveraged to execute code in the context of the firmware component.

No public proof-of-concept exploit is available at the time of publication, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2025-47356

Indicators of Compromise

Unexpected firmware crashes, subsystem restarts, or kernel panics referencing Qualcomm audio, Wi-Fi, or modem drivers
Repeated calls from a single unprivileged process to firmware IOCTLs or shared memory interfaces within a short time window
Anomalous device reboots correlated with process activity from non-system UIDs on Android or Linux hosts

Detection Strategies

Monitor kernel logs (dmesg, logcat) for slab corruption, SLUB warnings, or KASAN reports involving Qualcomm driver symbols
Baseline firmware interface usage per process and alert on high-frequency, multi-threaded access patterns to audio and connectivity device nodes
Correlate driver crash telemetry with process ancestry to identify locally executing exploitation attempts

Monitoring Recommendations

Enroll affected devices in a fleet vulnerability management program that tracks Qualcomm bulletin remediation status
Ship kernel and firmware crash reports to a centralized log platform for retrospective hunting
Track privileged escalation attempts from processes that historically interact with /dev/snd, wireless HAL, or modem control interfaces

How to Mitigate CVE-2025-47356

Immediate Actions Required

Apply the firmware updates referenced in the Qualcomm Security Bulletin January 2026 once made available by the device OEM
Inventory devices using the affected chipsets and prioritize patching for those exposing local execution surfaces to untrusted apps or users
Restrict installation of untrusted applications on devices that cannot be updated immediately

Patch Information

Qualcomm has released fixes as part of the January 2026 Security Bulletin. Device OEMs must integrate the updated firmware images into vendor images and distribute over-the-air updates. Consult the Qualcomm Security Bulletin January 2026 for the authoritative list of patched components and versions.

Workarounds

No official workaround exists; the underlying race condition can only be remediated by the vendor patch
Reduce local attack surface by enforcing application allow-listing and SELinux or equivalent mandatory access control policies
Disable optional audio or wireless features on affected devices when operationally acceptable until firmware updates are deployed

bash

# Verify current firmware/build fingerprint on Android devices
adb shell getprop ro.build.fingerprint
adb shell getprop ro.vendor.build.security_patch

# Confirm the vendor security patch level is 2026-01-01 or later