CVE-2026-64492 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems with the tmp006 temperature driver should review patch levels and system inventory to identify potential exposure. These stakeholders should verify Linux kernel configurations, monitor system logs, and plan vendor-supported updates or mitigations where exposure is confirmed.

Why it matters

A Linux kernel vulnerability was resolved, involving improper handling of the DRDY trigger in the tmp006 temperature driver. While exploitation and impact are not established, defenders should verify Linux kernel patch levels and system inventory to identify potential exposure.

• Verification of Linux kernel patch levels is required to ensure exposure
• System inventory checks are necessary to identify potential vulnerability

Technical summary

The tmp006_probe() function allocates a DRDY trigger with devm_iio_trigger_alloc() but registers it with iio_trigger_register(). This leads to a dangling entry in the global trigger list when the module is unloaded. The fix involves switching to devm_iio_trigger_register() to ensure proper cleanup. This change ensures that the trigger registration is undone in the same devm scope as the allocation, preventing potential system instability. Linux kernel developers and maintainers should review this fix to ensure proper implementation.

Defensive priority

Low

Recommended defensive actions

• Review Linux kernel configurations and versions to identify potential exposure
• Verify system inventory and patch levels for the tmp006 temperature driver
• Monitor system logs for unusual activity related to the tmp006 driver
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, the scope of affected systems and potential impact require further verification. Defenders should verify Linux kernel patch levels, review system inventory, and monitor system logs for unusual activity related to the tmp006 driver to identify potential exposure. The lack of a remove() callback in the driver leads to a dangling entry in the global trigger list when the module is unloaded.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.