A stack-based buffer overflow vulnerability exists in the Bosch Sensortec BHI385 SensorAPI (C library) within the debug message parser function… (CVE-2026-42805)
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.
AI Analysis
Technical Summary
The vulnerability exists in the Bosch Sensortec BHI385 SensorAPI's debug message parser function (bhi385_parse_debug_message in bhi385_parse.c). The function reads an 8-bit message length from attacker-controlled data without validating it against the fixed buffer size of 17 bytes. If the length byte exceeds 16, memcpy writes beyond the stack buffer boundary, causing a stack-based buffer overflow. This flaw can be exploited by a malicious or compromised sensor or bus participant to corrupt adjacent stack memory, potentially leading to firmware crashes, DoS, or arbitrary code execution.
Potential Impact
Exploitation of this vulnerability can cause memory corruption resulting in firmware crashes and Denial of Service. Due to the nature of stack-based buffer overflows, there is also potential for arbitrary code execution, which could compromise the affected device's integrity and security.
Mitigation Recommendations
No patch or official fix information is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, avoid using untrusted or potentially compromised sensors or bus participants that could send malicious debug messages.
A stack-based buffer overflow vulnerability exists in the Bosch Sensortec BHI385 SensorAPI (C library) within the debug message parser function… (CVE-2026-42805)
Description
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.
CVSS v3.1
Score 8.4high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability exists in the Bosch Sensortec BHI385 SensorAPI's debug message parser function (bhi385_parse_debug_message in bhi385_parse.c). The function reads an 8-bit message length from attacker-controlled data without validating it against the fixed buffer size of 17 bytes. If the length byte exceeds 16, memcpy writes beyond the stack buffer boundary, causing a stack-based buffer overflow. This flaw can be exploited by a malicious or compromised sensor or bus participant to corrupt adjacent stack memory, potentially leading to firmware crashes, DoS, or arbitrary code execution.
Potential Impact
Exploitation of this vulnerability can cause memory corruption resulting in firmware crashes and Denial of Service. Due to the nature of stack-based buffer overflows, there is also potential for arbitrary code execution, which could compromise the affected device's integrity and security.
Mitigation Recommendations
No patch or official fix information is currently available. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is released, avoid using untrusted or potentially compromised sensors or bus participants that could send malicious debug messages.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-7h94-3r4w-8qw8
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-42805"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6aa2af60acd9273b4925a64a
Added to database: 09/10/2026, 13:23:44 UTC
Last enriched: 09/10/2026, 13:28:54 UTC
Last updated: 09/10/2026, 16:52:45 UTC
Views: 4
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