CVE-2026-93282 Linux CVE debrief

Who should care

Linux kernel maintainers, system administrators, and users of the ksmbd module should assess their exposure and apply patches as necessary. They should also monitor system logs for potential exploitation attempts and review compensating controls for exposed systems.

Why it matters

The vulnerability in the Linux kernel's ksmbd module allows for incorrect access checks, potentially leading to STATUS_ACCESS_DENIED errors. Defenders should verify their exposure, apply patches, and monitor system logs.

• Defenders should verify that their Linux kernel is updated to the latest version to prevent potential exploitation.
• System administrators should monitor system logs for potential exploitation attempts.
• Linux kernel maintainers should review and apply the patches provided.

Technical summary

The ksmbd module in the Linux kernel did not properly handle access checks, leading to potential STATUS_ACCESS_DENIED errors. The vulnerability has been resolved with improved access checks and maximal access calculations. The fix involves updating the ksmbd module to correctly handle access checks and maximal access calculations. This includes considering Authenticated Users ACEs and processing only applicable ACEs for access calculations. The changes also modify the handling of ACCESS_SYSTEM_SECURITY denials and FILE_EXECUTE requests.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patches provided by the Linux kernel maintainers.
• Ensure that the ksmbd module is updated to the latest version.
• Monitor system logs for potential exploitation attempts.
• 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, including its description, CVSS score, and references to source code changes. The fix involves updating the ksmbd module to correctly handle access checks and maximal access calculations. The changes include considering Authenticated Users ACEs and processing only applicable ACEs. The fix also modifies the handling of ACCESS_SYSTEM_SECURITY denials and FILE_EXECUTE requests. The CVE record was published on 2026-09-24T16:17:25.570Z and has not be

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.