A stack-based buffer overflow vulnerability exists in the Bosch Sensortec BHI385 SensorAPI (C library) within the debug message parser function bhi385_parse_debug_message (located in bhi385_parse.c). The function parses FIFO events and extracts an 8-bit message length directly from the attacker-controlled event payload (callback_info->data_ptr[0]) without enforcing bounds checks or clamping the value. When copying the payload into a fixed-size stack buffer of 17 bytes (uint8_t debug_msg[17]) via memcpy, providing a length byte greater than 16 causes the function to write past the allocated stack boundary. This memory corruption can be triggered by a malicious or compromised sensor or bus participant, leading to a firmware crash, Denial of Service (DoS), or potentially the execution of arbitrary code via adjacent stack data corruption.
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This CVE exploits attack patterns that Casky's 0matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
CVE-2026-42805 is a stack-based buffer overflow in the Bosch Sensortec BHI385 SensorAPI, a C library used in embedded sensor systems. The vulnerability exists in the bhi385_parse_debug_message function, which processes FIFO events without validating message length parameters. An attacker can supply a malicious event payload with an oversized length value that causes the parser to write beyond a 17-byte stack buffer, enabling code execution or denial of service. This affects any embedded system or IoT device running the vulnerable BHI385 SensorAPI, including automotive, industrial control, and consumer IoT applications that process untrusted sensor data or accept remote sensor inputs.
While this CVE currently shows zero matching Casky skills, the underlying attack pattern—unsafe memory operations on attacker-controlled input—maps to fundamental memory safety vulnerabilities that Casky's AI-driven analysis would detect through code inspection and fuzzing techniques. A practitioner using Casky would identify this vulnerability through detection of: (1) unchecked array indexing on user-supplied data, (2) missing bounds validation before buffer write operations, and (3) fixed-size stack allocations receiving variable-length input. As new MITRE ATT&CK techniques are mapped to memory corruption exploits (such as T1203 for Exploitation of Client Software Vulnerability), Casky's extended reasoning capabilities would correlate these patterns, enabling practitioners to prioritize patching and implement input validation controls before exploitation occurs in their deployed systems.
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