CVE-2025-59610: Snapdragon G1 Gen 2 Use-After-Free Flaw

CVE-2025-59610 Overview

CVE-2025-59610 is a memory corruption vulnerability affecting a wide range of Qualcomm Snapdragon firmware products. The flaw occurs when the kernel processes IOCTL (input/output control) requests with mismatched API versions, while a user-space buffer is concurrently modified. This race condition between validation and use creates an exploitable memory corruption window. Qualcomm disclosed the issue in the June 2026 security bulletin and assigned it CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition. Successful exploitation requires local access and high privileges, limiting opportunistic abuse but remaining relevant for chained attacks on mobile, automotive, IoT, and compute platforms.

Critical Impact

A local attacker with high privileges can trigger memory corruption that compromises confidentiality, integrity, and availability on hundreds of Snapdragon-based devices.

Affected Products

• Qualcomm Snapdragon mobile platforms (Snapdragon 8 Elite, 8 Gen 1/2/3, 7 Gen 1/4, 6 Gen 1/3/4, 4 Gen 1/2, 888, 870, 865, 695, and others)
• Qualcomm automotive and IoT platforms (SA8155P, SA8295P, SA8770P, QCS6490, QCM6490, Robotics RB2/RB5, Flight RB5 5G)
• Qualcomm connectivity firmware (FastConnect 6200/6700/6800/6900/7800, QCA6391, QCA6574, WCN3xxx/6xxx/7xxx series, WCD/WSA audio codecs)

Discovery Timeline

• 2026-06-01 - CVE-2025-59610 published to NVD
• 2026-06-02 - Last updated in NVD database
• June 2026 - Qualcomm publishes the June 2026 Security Bulletin including the patch

Technical Details for CVE-2025-59610

Vulnerability Analysis

The vulnerability is rooted in how the affected Qualcomm kernel driver handles IOCTL requests when the user-supplied API version does not match the version expected by the driver. During version negotiation and parameter handling, the driver reads structures from a user-space buffer that the calling process can still modify on another thread. This produces a Time-of-check Time-of-use (TOCTOU) condition. After validation, the driver re-reads or operates on the buffer using cached size or type assumptions that no longer match the buffer content, leading to memory corruption inside the kernel.

Root Cause

The root cause is the absence of an atomic copy-then-validate pattern. The driver should copy the IOCTL payload from user-space into a kernel buffer once, then validate and consume only the kernel copy. Instead, the driver references the user-space buffer multiple times, allowing a second thread to swap field values between version checks and field consumption. Combined with API version mismatch handling paths that take a different code branch, this enables an attacker to desynchronize the validated metadata from the actual buffer used.

Attack Vector

Exploitation requires local access and high privileges, with no user interaction. An attacker with code execution at a privileged context opens the affected device node, issues an IOCTL with a deliberately mismatched API version, and races a second thread that mutates the shared user-space buffer. Winning the race corrupts kernel memory, which can be leveraged for privilege boundary violations on the device, persistence below the operating system, or destabilization of trusted firmware components.

No verified public proof-of-concept is currently available. The vulnerability mechanism is described in prose; consult the Qualcomm advisory for component-level details.

Detection Methods for CVE-2025-59610

Indicators of Compromise

• Unexpected kernel panics or device reboots on Snapdragon-based endpoints following IOCTL activity from non-system processes
• Crash dumps referencing Qualcomm driver components handling versioned IOCTL interfaces
• Privileged processes opening device nodes they do not normally interact with, followed by high-frequency IOCTL calls

Detection Strategies

• Monitor mobile and IoT fleet telemetry for repeated ioctl() failures and version-mismatch errors against Qualcomm kernel drivers
• Hunt for privileged userland processes spawning worker threads that race on shared buffers passed to driver interfaces
• Correlate firmware build identifiers with the Qualcomm June 2026 bulletin to identify unpatched assets

Monitoring Recommendations

• Enable kernel crash reporting and forward dumps to a centralized analytics backend for triage
• Track abnormal dmesg entries referencing the affected drivers across managed Android, automotive, and IoT endpoints
• Baseline normal IOCTL usage per device class to surface anomalous version-mismatch attempts

How to Mitigate CVE-2025-59610

Immediate Actions Required

• Apply the firmware updates referenced in the Qualcomm June 2026 Security Bulletin for each affected chipset
• Inventory Snapdragon-based devices using CPE identifiers and prioritize patching of automotive, industrial, and high-privilege endpoints
• Restrict the ability of untrusted applications to obtain elevated privileges that could reach the vulnerable IOCTL interfaces

Patch Information

Qualcomm has released firmware updates addressing CVE-2025-59610 as part of the June 2026 Security Bulletin. OEMs and device integrators must rebuild and distribute affected firmware images to end devices. Android device vendors typically ship the fix as part of a monthly security patch level aligned with the Qualcomm bulletin.

Workarounds

• Disable or restrict access to non-essential Qualcomm driver interfaces in device policy where feasible
• Enforce strict application allowlisting on managed devices to limit which processes can issue IOCTL calls to affected drivers
• Where patch deployment is delayed, isolate vulnerable IoT and automotive devices on segmented networks with restricted physical access

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

# Inventory loaded Qualcomm kernel modules (requires root)
adb shell su -c 'lsmod | grep -iE "qcom|qca|wcn|wcd|wsa"'