CVE-2025-59617: Qualcomm Fastconnect 6700 Use-After-Free

CVE-2025-59617 Overview

CVE-2025-59617 is a memory corruption vulnerability affecting a broad range of Qualcomm firmware components, including FastConnect, Snapdragon mobile platforms, WCD/WCN/WSA audio and connectivity chipsets, and XR platforms. The flaw is triggered when multiple IOCTL calls are processed using the same buffer file descriptor as input, resulting in a Use After Free condition [CWE-416]. A local authenticated attacker able to reach the vulnerable driver interface can corrupt kernel memory and impact confidentiality, integrity, and availability of the device. Qualcomm addressed the issue in its July 2026 Security Bulletin.

Critical Impact
Successful exploitation can lead to memory corruption in a kernel-mode driver, enabling privilege escalation or denial of service on affected Qualcomm-powered devices.

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 WCD, WCN, and WSA audio and connectivity chipset firmware (WCD9370–WCD9395, WCN3950–WCN7881, WSA8810–WSA8855C)

Discovery Timeline

2026-07-06 - CVE-2025-59617 published to NVD
2026-07-07 - Last updated in NVD database

Technical Details for CVE-2025-59617

Vulnerability Analysis

The vulnerability resides in a Qualcomm driver that exposes an IOCTL interface accepting a buffer file descriptor. When user-space issues multiple IOCTL calls referencing the same file descriptor, the driver mishandles the lifecycle of the associated kernel object. This produces a Use After Free condition classified under [CWE-416]. The attack requires local access and low privileges, with user interaction needed to trigger the vulnerable code path. Successful exploitation corrupts kernel memory structures, which can be shaped by an attacker to hijack control flow or leak sensitive kernel data.

Root Cause

The root cause is improper reference counting and lifecycle management for the buffer referenced by the file descriptor. When the driver processes concurrent or repeated IOCTL requests against the same descriptor, one path releases the underlying kernel object while another path retains and dereferences a stale pointer to it. This dangling reference is the classic Use After Free primitive, and it occurs in a privileged execution context inside the Qualcomm driver stack.

Attack Vector

Exploitation requires a local attacker with the ability to execute code on the device and open the vulnerable driver device node. The attacker allocates a buffer, obtains its file descriptor, and issues multiple IOCTL calls referencing that descriptor to trigger the freed-object reuse. Because the vulnerable code runs in kernel context, memory corruption can be leveraged for elevation of privilege from a low-privileged app or user process. No network access is required, but user interaction is a factor in the delivery scenario.

No public proof-of-concept exploit is available for CVE-2025-59617 at the time of publication. See the Qualcomm July 2026 Security Bulletin for vendor technical details.

Detection Methods for CVE-2025-59617

Indicators of Compromise

Unexpected kernel panics, watchdog resets, or driver crash logs referencing Qualcomm audio, connectivity, or DSP subsystems.
Abnormal IOCTL request patterns from unprivileged processes targeting Qualcomm device nodes.
Presence of unsigned or unknown user-space binaries repeatedly opening buffer file descriptors and issuing rapid IOCTL sequences.

Detection Strategies

Monitor kernel log buffers (dmesg, logcat -b kernel) for use-after-free indicators such as KASAN reports, slab corruption warnings, or oops traces in Qualcomm driver modules.
Baseline normal application behavior on managed mobile and embedded devices, and flag processes issuing high-frequency IOCTL calls with duplicate file descriptors.
Use mobile threat defense tooling to detect on-device privilege escalation attempts and unexpected root-level activity.

Monitoring Recommendations

Centralize device crash and telemetry data into a SIEM or data lake to correlate kernel crashes with process activity over time.
Track firmware and patch level compliance across the fleet against the Qualcomm July 2026 Security Bulletin advisory.
Alert on newly installed applications that request access to low-level Qualcomm device interfaces without a legitimate business need.

How to Mitigate CVE-2025-59617

Immediate Actions Required

Apply the Qualcomm July 2026 firmware updates to every affected chipset and platform as they are shipped by device OEMs.
Inventory all fleet devices using the affected FastConnect, Snapdragon, WCD, WCN, WSA, and XR components to prioritize patch rollout.
Restrict installation of untrusted applications on managed mobile, XR, and embedded devices until patches are deployed.

Patch Information

Qualcomm released fixes in the Qualcomm July 2026 Security Bulletin. Because the vulnerable code is delivered as firmware and kernel drivers, patches must be integrated by OEMs and shipped through standard device update channels. Coordinate with device vendors to confirm that their firmware release incorporates the July 2026 Qualcomm patch level.

Workarounds

Enforce mobile device management (MDM) policies that block sideloading and restrict app installation to vetted stores.
Limit access to Qualcomm driver device nodes through SELinux or platform sandboxing policies where the OEM configuration permits.
Decommission or isolate end-of-life devices that will not receive the July 2026 firmware update from sensitive networks.

bash

# Example: verify Android security patch level after OEM firmware update
adb shell getprop ro.build.version.security_patch
adb shell getprop ro.vendor.build.security_patch