CVE-2025-59616: Qualcomm Fastconnect Use After Free Flaw

CVE-2025-59616 Overview

CVE-2025-59616 is a use-after-free memory corruption vulnerability affecting a broad range of Qualcomm firmware components, including FastConnect, Snapdragon mobile platforms, and WCN/WSA/WCD audio and connectivity chipsets. The flaw occurs when the driver processes multiple IOCTL (input/output control) calls that reuse the same buffer file descriptor, resulting in access to already-freed kernel memory [CWE-416]. A local, authenticated attacker with low privileges can trigger the condition to corrupt kernel memory, potentially achieving elevated code execution on affected devices. Qualcomm addressed the issue in its July 2026 Security Bulletin.

Critical Impact
A local low-privileged attacker can trigger memory corruption in Qualcomm firmware, leading to loss of confidentiality, integrity, and availability at the kernel level.

Affected Products

Qualcomm FastConnect 6700, 6900, and 7800 firmware
Qualcomm Snapdragon 460, 662, 8 Elite Gen 5, AR1 Gen 1, XR2 5G, and XR2+ Gen 1 platform firmware
Qualcomm WCN, WCD, WSA, QCM, QMP, SXR, SC8380XP, SD865 5G, SM6850, SM8845P, and Video Collaboration VC3 firmware

Discovery Timeline

2026-07-06 - CVE-2025-59616 published to NVD
2026-07-07 - Last updated in NVD database

Technical Details for CVE-2025-59616

Vulnerability Analysis

The vulnerability is a use-after-free condition in the IOCTL handling path of affected Qualcomm firmware components. When user-space code issues multiple IOCTL requests referencing the same buffer file descriptor, the driver dereferences memory that has already been released back to the allocator. Because the attack vector is local and requires only low privileges, any process with access to the affected device node can attempt exploitation. Successful exploitation impacts confidentiality, integrity, and availability, and typically yields kernel-context code execution on mobile and embedded devices built around the affected chipsets.

Root Cause

The root cause is improper lifecycle management of a shared buffer object referenced by a file descriptor across IOCTL calls. The driver frees the underlying buffer while another code path still holds a reference to it. Subsequent IOCTL processing dereferences the stale pointer, satisfying the classic use-after-free (UAF) pattern described by [CWE-416]. This class of bug is often exploitable because attackers can race to reallocate the freed slab region with attacker-controlled data before the stale reference is used.

Attack Vector

Exploitation requires local access with low privileges, such as an unprivileged application on an Android device or a service running on an embedded platform using the affected firmware. The attacker opens the vulnerable device interface and issues a sequence of IOCTL calls that reuse the same buffer file descriptor. By combining the free-and-reuse pattern with heap grooming, an attacker can influence what data occupies the freed memory when it is next accessed, transforming the UAF into arbitrary read or write primitives and, ultimately, kernel privilege escalation. Refer to the Qualcomm July 2026 Security Bulletin for component-level details.

Detection Methods for CVE-2025-59616

Indicators of Compromise

Unexpected kernel panics, watchdog resets, or SELinux denials referencing Qualcomm driver modules on affected devices.
Repeated IOCTL calls from an unprivileged process against the same buffer file descriptor followed by process crashes.
Presence of unknown or unsigned applications interacting directly with FastConnect, WCN, WCD, or WSA device nodes.

Detection Strategies

Monitor kernel logs and crash dumps for signatures consistent with use-after-free faults in Qualcomm connectivity or audio drivers.
Baseline legitimate IOCTL usage patterns from OEM system services and alert on deviations originating from unprivileged UIDs.
Use mobile threat defense telemetry to flag applications performing anomalous low-level device interactions.

Monitoring Recommendations

Track patch level attestation on managed mobile fleets to verify that the July 2026 Qualcomm firmware fixes are applied.
Ingest device logs into a centralized data lake to correlate crash telemetry with process and application context.
Alert on installations of applications requesting hardware-adjacent capabilities not typical for their category.

How to Mitigate CVE-2025-59616

Immediate Actions Required

Inventory devices and embedded platforms that ship with affected Qualcomm chipsets and firmware components.
Apply the OEM firmware update incorporating Qualcomm's July 2026 security patch as soon as it is available for each device model.
Restrict installation of untrusted applications on managed mobile endpoints until patches are deployed.

Patch Information

Qualcomm published fixes as part of the Qualcomm July 2026 Security Bulletin. Because Qualcomm distributes patches through downstream OEMs and carriers, administrators should coordinate with device vendors to obtain and validate the corresponding firmware or Android security patch level containing the fix for CVE-2025-59616.

Workarounds

Enforce mobile device management (MDM) policies that block sideloading and restrict apps to vetted enterprise or store sources.
Limit local access on embedded and IoT platforms by hardening user accounts and disabling unnecessary shell or debug interfaces.
Where feasible, restrict permissions on affected device nodes so that only trusted system components can issue IOCTL calls.

bash

# Verify Android security patch level on managed devices
adb shell getprop ro.build.version.security_patch

# Example MDM check: enforce minimum patch level of July 2026
# (pseudocode - implement in your MDM policy engine)
if [ "$(adb shell getprop ro.build.version.security_patch)" \< "2026-07-01" ]; then
  echo "Device missing CVE-2025-59616 fix - quarantine required"
fi