CVE-2026-64497

What it actually does

This vulnerability is a sign-extension and bit-masking defect in the Linux kernel Industrial I/O chemical sensor driver for Sensirion SCD30 devices. The affected code handles 32-bit floating-point sensor values and clears the sign bit using an incorrectly sized mask, which can corrupt the exponent portion of the value. The practical technical effect is incorrect parsing or conversion of sensor readings in the kernel driver. Based on the available description, this is not a typical remote code execution, privilege escalation, or authentication bypass issue; exploitation would generally require the vulnerable driver to be present and interacting with an SCD30-compatible sensor or crafted sensor data path.

Why it matters to the business

Organizations using Linux systems connected to SCD30 chemical/CO2 sensors may receive inaccurate environmental sensor readings, which can affect monitoring, automation, safety controls, or downstream operational decisions that rely on those values. The currently reported exploitation likelihood is low, EPSS is 0.00177, there is no known CISA KEV listing, and there is no indication of ransomware use, so this should generally be prioritized as a reliability and integrity fix rather than an emergency security incident unless the affected driver is used in safety-critical or industrial monitoring environments.

How an attack unfolds

An attacker would first need a system running a vulnerable Linux kernel with the SCD30 Industrial I/O driver enabled and reachable through a physical, emulated, or otherwise controllable sensor data source. The attacker would then attempt to influence the floating-point value delivered to the driver so that the flawed sign-bit clearing operation corrupts the exponent. The resulting malformed conversion could produce incorrect readings exposed through the IIO subsystem or consumed by applications, automation, or monitoring processes. There is no public indication from the provided data that this issue has a mature exploit, is being exploited in the wild, or is associated with named threat actors.

How to fix it

Apply a Linux kernel update that includes the upstream fix for the SCD30 driver sign-extension bug. If vendor kernel packages are used, update to the vendor-provided kernel version that backports this fix. If building custom kernels, incorporate the patch that replaces the incorrect manual bit manipulation with correct FIELD_GET-based extraction and related cleanup in the scd30 driver. Where patching cannot be done immediately, reduce exposure by disabling or unloading the SCD30 driver if it is not required, preventing untrusted or test devices from being attached to production systems, and validating sensor readings at the application layer before they drive operational decisions.

How to confirm the fix worked

Confirm whether the system is exposed by checking whether the running kernel includes the SCD30 driver and whether SCD30 devices are present through the Industrial I/O subsystem. Validate remediation by verifying that the installed kernel package or source tree contains the corrected scd30 driver implementation and by rebooting into the fixed kernel where required. Functional validation should include comparing SCD30 readings against a trusted reference sensor or known-good test values, especially values that exercise sign and exponent handling. Also confirm that no vulnerable out-of-tree or vendor-modified copy of the driver remains in use.

Typical attack path

1. Identify a Linux system using the SCD30 chemical sensor driver.
2. Confirm that the vulnerable kernel driver is loaded or built into the running kernel.
3. Gain the ability to influence data returned by an attached or emulated SCD30-compatible sensor.
4. Send or cause sensor values that exercise the flawed sign-bit masking path.
5. Trigger incorrect float conversion in the kernel driver.
6. Cause downstream applications or control logic to consume inaccurate sensor readings.

How to detect it

This issue is more likely to produce incorrect sensor data than conventional intrusion artifacts. To assess possible prior exploitation or impact, review kernel logs, system journals, hardware monitoring logs, application logs that ingest IIO sensor data, and automation or alerting records for abrupt, impossible, or inconsistent SCD30 readings. Look for unusual attachment of SCD30-compatible devices, unexpected IIO device creation, driver reloads, kernel warnings, or sensor values that do not match physical conditions or reference instruments. Because no known public exploit, threat actor activity, or ransomware use is reported, detection should focus on exposure and anomalous sensor behavior rather than malware indicators.

What your security team should do

• Inventory Linux systems that use Industrial I/O chemical sensors, especially Sensirion SCD30 devices.
• Prioritize patching for systems where environmental readings feed safety, industrial automation, HVAC, compliance, or alerting workflows.
• Update affected kernels through the operating system or device vendor and reboot into the fixed kernel.
• If the driver is not required, disable it or remove the module from deployable kernel configurations.
• Add sanity checks and threshold validation in applications that consume CO2, temperature, or humidity readings from the IIO subsystem.
• Monitor vendor advisories for exact fixed kernel package versions, since no specific fixed versions were provided in the input.
• Treat this as low urgency for general-purpose servers with no SCD30 hardware or driver usage, given low EPSS, no KEV listing, and no known exploit maturity.