CVE-2026-100078 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, as well as users who rely on the iwlwifi mei functionality in their systems, should review the patch notes and verify system configurations for potential exposure. The vulnerability has been resolved, and no exploitation has been reported. Affected operators include Linux kernel developers and maintainers, and affected platforms include systems that use the iwlwifi mei functionality.

Why it matters

A vulnerability was found in the Linux kernel's iwlwifi mei functionality. The iwl_mei_write_cyclic_buf() function was called with an incorrect argument, passing the q_head pointer instead of the cldev. This issue has been resolved. Linux kernel developers and maintainers should review the patch notes and verify system configurations for potential exposure.

• Verify Linux kernel patch for iwlwifi mei functionality
• Review system configurations for potential exposure

Technical summary

The iwl_mei_write_cyclic_buf() function in the Linux kernel's iwlwifi mei functionality was called with an incorrect argument, passing the q_head pointer instead of the cldev. This issue has been resolved. The affected product is the Linux kernel, and the vulnerability class is related to the iwlwifi mei functionality. The vulnerability has been resolved, and no exploitation has been reported. Linux kernel developers and maintainers should review the patch notes and verify system configurations for potential exposure.

Defensive priority

Low priority, as the vulnerability has been resolved and no exploitation has been reported.

Recommended defensive actions

• Review Linux kernel patch notes for CVE-2026-100078
• Verify iwlwifi mei functionality in Linux kernel
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. The Linux kernel patch notes indicate that the iwl_mei_write_cyclic_buf() function was called with an incorrect argument. The vulnerability has been resolved, and no exploitation has been reported. Defenders should verify Linux kernel patch notes for CVE-2026-100078 and review system configurations for potential exposure.

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.