CVE-2024-42086

What it actually does

Integer overflows in BME680 compensate functions caused by unchecked bit-shift operations on sensor calibration data can produce incorrect computed values for temperature, pressure, humidity and gas resistance or trigger undefined behavior in kernel context.

Why it matters to the business

Devices relying on the BME680 sensor may return inaccurate environmental readings, affecting monitoring, HVAC, or industrial-control applications that depend on reliable sensor output; the issue is local-only and carries low exploitation probability.

How an attack unfolds

An attacker with local access loads the bme680 kernel module, supplies crafted calibration values or raw ADC readings that trigger the overflow paths during compensation, and observes resulting incorrect sensor output or potential kernel instability; no remote or unauthenticated vectors exist and no public exploitation by the listed threat actors has been observed.

How to fix it

Apply the upstream fix commit 6fa31bbe2ea8665ee970258eb8320cbf231dbe9e or later; rebuild and deploy the updated Linux kernel image containing the corrected compensate functions; reboot affected systems.

How to confirm the fix worked

Confirm the running kernel contains commit 6fa31bbe2ea8665ee970258eb8320cbf231dbe9e or equivalent backport; exercise the driver with known-good calibration data and verify compensated outputs match expected ranges without overflow artifacts.

Typical attack path

1. Obtain local code execution or physical access on a Linux system using the bme680 driver
2. Trigger module initialization with the sensor present
3. Feed calibration or raw data values engineered to cause signed/unsigned overflows during bit shifts in compensate functions
4. Observe incorrect compensated readings or driver/kernel side effects

How to detect it

Inspect kernel logs and dmesg for bme680 driver warnings or anomalous compensation results; correlate unexpected sensor value spikes or out-of-range readings with module load events; no post-exploitation artifacts are known.

What your security team should do

• Prioritize kernel update to the fixed commit on all systems exposing the bme680 driver
• Audit sensor-dependent applications for tolerance to incorrect readings until patched
• Monitor kernel build pipelines to ensure the patch is included in future distributions