CVE-2026-72395 Linux CVE debrief

Who should care

Users of the Linux kernel, particularly those using the hwmon and pmbus components, should be aware of this vulnerability and ensure their systems are updated with the latest kernel version. This involves reviewing system configurations for potential mitigations and monitoring system logs for related events. The vulnerability has been resolved, but users must take proactive steps to update their systems and verify the effectiveness of the fix in their environment. Additionally, users should review compensating controls for exposed systems while remediation is scheduled and verified. They should also track exceptions, retest remediated assets, and close the item only after evidence is documented. System administrators and security teams should prioritize updating the Linux kernel to prevent exploitation of this vulnerability. They should also consider implementing monitoring and detection measures to identify potential related events. Furthermore, users should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. This ensures a coordinated and timely response to the vulnerability. By taking these steps, users can minimize the risk associated with this vulnerability and maintain the security and integrity of their systems. It is essential to note that the vulnerability has been resolved, and updating the Linux kernel to the latest version will address the issue. However, users must remain vigilant and continue to monitor their systems for any potential related events. This will enable them to quickly identify and respond to any potential security incidents. Overall, users of the Linux kernel should take proactive steps to update their systems, review system configurations, and monitor system logs to ensure the security and integrity of their systems. By doing so, they can minimize the risk associated with this vulnerability and maintain the security of their systems. The vulnerability's resolution highlights the importance of keeping systems up-to-date and implementing robust security measures to prevent exploitation of known vulnerabilities. Users should prioritize updating their systems and implementing the

Technical summary

The vulnerability is in the Linux kernel's hwmon: (pmbus) Fix passing events to regulator core. A worker was introduced to batch regulator events over time using atomic_or(). However, when multiple distinct faults occur before the worker runs, the combined bitmask fails to match any case in the regulator_handle_critical() function, bypassing the critical hw_protection_trigger(). The fix involves passing events bit by bit to the regulator event handler.

Defensive priority

This vulnerability affects the Linux kernel and has been resolved. Users should ensure their systems are updated with the latest kernel version.

Recommended defensive actions

• Update the Linux kernel to the latest version
• Review system configurations for potential mitigations
• Monitor system logs for related events
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The vulnerability was introduced in the Linux kernel and has been resolved by a commit that fixes passing events to the regulator core. The issue arises from a worker that batches regulator events over time using atomic_or(), which then passes the combined bitmask unmodified to regulator_notifier_call_chain().

Official resources