CVE-2026-99021 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems who need to ensure the security and stability of their systems. These individuals should review the patch and apply it to ensure the regulator subsystem is secure. They should also verify Linux kernel versions and apply updates as necessary to prevent potential issues.

Why it matters

A vulnerability in the Linux kernel's regulator subsystem has been addressed, and defenders should take steps to verify and apply the necessary patches to ensure system security and stability.

• Defenders should verify Linux kernel versions and apply updates to ensure the regulator subsystem is secure
• System administrators should monitor system logs for potential issues related to the regulator subsystem
• Linux distribution maintainers should ensure that their packages include the necessary patches

Technical summary

The of_regulator_bulk_get_all() function in the Linux kernel's regulator subsystem did not properly initialize supply names in the returned array. This could potentially lead to issues when the array was passed to regulator_bulk_enable(). The fix involves copying each name into the array's own allocation, ensuring that the supply names are properly initialized. Linux kernel developers and maintainers should review the patch and apply it to ensure the regulator subsystem is secure. The patch ensures that the supply names are properly initialized, preventing potential issues.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch to ensure the of_regulator_bulk_get_all() function properly initializes supply names
• Verify the Linux kernel version and apply updates as necessary
• Monitor system logs for potential issues related to the regulator subsystem
• 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
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details about the vulnerability and its fix. The Linux kernel's regulator subsystem is affected, specifically the of_regulator_bulk_get_all() function. The fix involves copying each name into the array's own allocation, ensuring that the supply names are properly initialized. Defenders should verify Linux kernel versions and apply updates to ensure the regulator subsystem is secure. The source item provides additional information about the vulnerability, but the exact scope of affected systems is

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.