CVE-2026-42808 in COINES_SDK
Summary
by MITRE • 09/10/2026
An issue was discovered in Bosch Sensortec COINES_SDK versions 2.0 through 2.11.
The host streaming API function {{coines_read_stream_sensor_data()}} fails to validate the boundaries of the caller-provided destination buffer.
Internally, the stream processing mechanism in {{comm_intf_process_stream_response()}} discards the requested {{number_of_samples}} argument and copies the entirety of the streaming ring buffer's accumulated data into {{coines_stream_rsp_buf}}.
Subsequently, {{coines_read_stream_sensor_data()}} unconditionally executes a {{memcpy}} of the ring buffer size into the caller-provided buffer without verifying if the destination memory allocation is large enough.
A malicious or compromised hardware board connected via USB or BLE can exploit this by streaming a high volume of sensor samples, causing a heap or stack-based buffer overflow on the host desktop environment.
This can result in a Denial of Service (DoS) or potential arbitrary code execution on the host machine.
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Analysis
by VulDB Data Team • 09/10/2026
The vulnerability identified within Bosch Sensortec COINES_SDK versions 2.0 through 2.11 represents a critical memory safety failure rooted in improper input validation and boundary checking during data streaming operations. The core of this issue lies in the interaction between the host-side API function coines_read_stream_sensor_data() and the internal stream processing mechanism comm_intf_process_stream_response(). When an application invokes the read stream sensor data function, it typically provides a destination buffer along with parameters indicating how many samples are requested. However, the underlying implementation does not adhere to these constraints. Instead of respecting the number_of_samples argument provided by the caller, the system discards this value and proceeds to copy the entirety of the accumulated data from the streaming ring buffer into an internal response buffer named coines_stream_rsp_buf. This behavior creates a discrepancy between the expected data volume based on user input and the actual volume processed internally, setting the stage for subsequent memory corruption if not handled correctly downstream.
Following the accumulation of data in the internal buffer, the system executes an unconditional memcpy operation to transfer this accumulated ring buffer size into the caller-provided destination buffer. Crucially, there is no verification step to ensure that the allocated size of the caller's buffer is sufficient to hold the entire contents of the ring buffer. This lack of bounds checking means that if a connected device streams sensor data exceeding the capacity of the host application's pre-allocated memory space, the memcpy operation will write beyond the end of the destination array or heap allocation. In C-based software development, such unchecked memory writes are among the most dangerous classes of vulnerabilities because they directly compromise the integrity of the process memory layout and can lead to severe runtime failures or security breaches.
The operational impact of this flaw is significant, particularly in environments where hardware boards communicate with host systems via USB or Bluetooth Low Energy interfaces. An attacker who has physical access to a connected device or who controls a compromised sensor board can exploit this vulnerability by streaming an abnormally high volume of sensor samples. This action forces the SDK to attempt copying large amounts of data into a potentially undersized buffer on the host machine. The immediate consequence is often a Denial of Service condition, manifested as application crashes, segmentation faults, or system instability due to heap corruption. However, in more sophisticated attack scenarios where memory layout can be manipulated through careful control of input sizes and types, this buffer overflow may allow for arbitrary code execution. By overwriting adjacent memory structures such as function pointers or return addresses on the stack, an attacker could redirect program flow to execute malicious payloads with the privileges of the compromised application.
From a classification perspective, this vulnerability aligns closely with CWE-120 Buffer Copy without Checking Size of Input Classic Buffer Overflow and CWE-787 Out-of-bounds Write. The failure to validate input against buffer boundaries is also indicative of CWE-20 Improper Input Validation. In the context of attack tactics, this flaw facilitates exploitation via ATT&CK technique T1059 Command and Scripting Interpreter if code execution is achieved, or more broadly under initial access vectors involving peripheral device interaction. The reliance on USB or BLE interfaces places this vulnerability within the scope of physical layer attacks where an adversary interacts with hardware peripherals to compromise host systems, a scenario increasingly relevant in Internet of Things ecosystems and industrial control environments.
Mitigation strategies must focus on enforcing strict memory safety checks at both the API level and the internal processing layers. Developers should modify coines_read_stream_sensor_data() to calculate the exact size of data being transferred from the ring buffer and compare it against the provided destination buffer length before invoking memcpy. If the incoming data exceeds the available space, the function must either truncate the copy safely or return an error code indicating insufficient buffer capacity rather than proceeding with a destructive write operation. Additionally, implementing static analysis tools during development can help detect such unchecked memory operations early in the lifecycle. For users of affected SDK versions, immediate updates to patched releases are recommended. In scenarios where updating is not immediately feasible, application-level workarounds should include rigorous validation of buffer sizes before calling streaming APIs and limiting the rate or volume of data requests from connected hardware devices to prevent overwhelming internal buffers.