CVE-2025-59614: Qualcomm Cologne Buffer Overflow Flaw

CVE-2025-59614 Overview

CVE-2025-59614 is a memory corruption vulnerability affecting a wide range of Qualcomm firmware components, including FastConnect 6900/7800, WCD audio codecs, WSA smart speaker amplifiers, and the SC8380XP compute platform. The flaw occurs when a random number generator (RNG) command is issued with an output buffer that is smaller than the data the firmware writes back, resulting in an out-of-bounds write [CWE-787]. The vulnerability requires local access and high privileges to trigger, but successful exploitation can compromise the confidentiality, integrity, and availability of the affected component. Qualcomm addressed the issue in the Qualcomm June 2026 Security Bulletin.

Critical Impact

A privileged local caller can corrupt firmware memory by invoking the RNG command with an undersized output buffer, enabling code execution or denial of service on affected Qualcomm chipsets.

Affected Products

• Qualcomm FastConnect 6900 and FastConnect 7800 connectivity systems
• Qualcomm WCD9378C, WCD9380, WCD9385 audio codecs and WSA8840/WSA8845/WSA8845H smart speaker amplifiers
• Qualcomm SC8380XP compute platform, Cologne, IQX5121, IQX7181, QCA0000, and X2000/XG101 firmware series

Discovery Timeline

• 2026-06-01 - CVE-2025-59614 published to NVD
• June 2026 - Qualcomm releases fixes in the June 2026 Security Bulletin
• 2026-06-02 - Last updated in NVD database

Technical Details for CVE-2025-59614

Vulnerability Analysis

The defect is an out-of-bounds write [CWE-787] in the firmware code path that services a random number generator command. When a caller submits the command, the firmware writes the requested random bytes to a caller-supplied output buffer. The implementation does not validate that the buffer is large enough to receive the generated data before performing the write, so excess bytes overflow into adjacent memory.

Because the corruption occurs inside firmware, the affected memory may include control structures, function pointers, or state used by other firmware tasks. The result is a deterministic memory corruption primitive bounded only by the size mismatch between the supplied buffer and the firmware's write length.

Root Cause

The root cause is missing length validation in the RNG command handler. The handler treats the output buffer size argument as trusted or fails to compare it against the number of bytes it intends to emit. With no bounds check, a smaller-than-required buffer leads to a linear out-of-bounds write of cryptographically generated bytes into adjacent firmware memory.

Attack Vector

The vulnerability is reachable only by a local actor that already holds high privileges on the host. An attacker invokes the RNG command through the standard firmware command interface and passes an output buffer length that is smaller than the RNG output size. The firmware writes past the end of the buffer, corrupting adjacent memory. There is no network attack vector and no user interaction is required.

No public proof-of-concept code is available for CVE-2025-59614. Technical specifics of the command interface are documented in the Qualcomm June 2026 Security Bulletin.

Detection Methods for CVE-2025-59614

Indicators of Compromise

• Unexpected resets, watchdog timeouts, or crash dumps from FastConnect, WCD, WSA, or SC8380XP firmware after privileged software invokes RNG services.
• Kernel or driver logs showing repeated RNG command submissions with abnormally small output buffer sizes from a single process.
• Firmware integrity self-test failures or anomalous entropy service errors on affected Qualcomm components.

Detection Strategies

• Audit host kernel drivers that issue Qualcomm RNG commands and log buffer length parameters for outliers.
• Monitor endpoint telemetry for processes loading or interacting with Qualcomm firmware command interfaces from non-standard locations.
• Correlate firmware crash artifacts with the calling process tree to identify abuse of the RNG command path.

Monitoring Recommendations

• Forward kernel and firmware diagnostic logs to a centralized SIEM and alert on repeated firmware faults tied to RNG service calls.
• Track installation state of the June 2026 Qualcomm patches across managed endpoints and flag devices still running vulnerable firmware.
• Baseline normal RNG command volume and parameters to detect anomalous local activity that may indicate exploitation attempts.

How to Mitigate CVE-2025-59614

Immediate Actions Required

• Apply the firmware updates referenced in the Qualcomm June 2026 Security Bulletin through the relevant OEM or platform vendor channel.
• Inventory devices running FastConnect 6900/7800, WCD93xx, WSA884x, SC8380XP, and the listed X2000/XG101/IQX firmware to confirm patch coverage.
• Restrict local high-privilege access on affected devices, since exploitation requires PR:H and local execution.

Patch Information

Qualcomm published fixes for CVE-2025-59614 in the June 2026 Security Bulletin. OEMs integrate these firmware updates into device-level patches; administrators should track downstream releases from the device manufacturer and apply them as they become available. See the Qualcomm June 2026 Security Bulletin for component-level details.

Workarounds

• Limit administrative and driver-level access to trusted operators until firmware updates are deployed.
• Disable or remove host-side software components that issue Qualcomm RNG commands if they are not required for device operation.
• Use application allowlisting on managed endpoints to prevent untrusted privileged binaries from interacting with the firmware command interface.

# Verify that firmware on affected Qualcomm components has been updated
# Example: list firmware versions reported by the host on Linux
ls /sys/class/firmware/ 2>/dev/null
dmesg | grep -iE 'qualcomm|fastconnect|wcd93|wsa884|sc8380'