CVE-2026-93801 Linux CVE debrief

Who should care

Linux kernel maintainers, administrators, and users of the smb/client component should assess exposure and apply patches. The vulnerability affects the smb/client component, and it is essential to verify and apply patches to prevent potential issues. The lack of zero-initialization of stack-allocated cifs_open_info_data can lead to incorrect field values if not set later.

Why it matters

A high-severity vulnerability in the Linux kernel smb/client component requires patching and exposure assessment to prevent potential issues.

• Verify and apply patches to prevent potential incorrect field values
• Assess exposure of Linux kernel smb/client component in your environment

Technical summary

The Linux kernel smb/client component has a vulnerability caused by the lack of zero-initialization of stack-allocated cifs_open_info_data. This can lead to incorrect field values if not set later. The vulnerability has been resolved with a patch, and it is essential to verify and apply patches to prevent potential issues. The CVE record and NVD vulnerability detail page provide information on the vulnerability, but details on exploitation and impact are limited. It is crucial to assess exposure and apply patches to prevent potential issues.

Defensive priority

Assess and apply patches for Linux kernel smb/client component

Recommended defensive actions

• Assess exposure of Linux kernel smb/client component in your environment
• Verify and apply patches from the Linux kernel maintainers
• Monitor for potential incorrect field values in cifs_open_info_data
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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 vulnerability detail page provide information on the vulnerability, but details on exploitation and impact are limited. The Linux kernel patch has been provided, and it is essential to review the official advisory or CVE record to validate affected scope, severity, and vendor guidance. The vulnerability affects the smb/client component, and it is crucial to assess exposure and apply patches to prevent potential issues. The lack of zero-initialization of stack-allocated cifs_open_info_data can lead to incorrect

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.