CVE-2026-93794 Linux CVE debrief

Who should care

Linux system administrators and users with file systems relying on Linux kernel functionality should verify and apply kernel updates to ensure data integrity. The vulnerability's scope and impact require further verification. Affected operator, platform, vulnerability-management, and security-team impact should be considered.

Why it matters

CVE-2026-93794 is a Linux kernel vulnerability that can lead to data inconsistencies when punching holes in files. Linux system administrators and users with file systems relying on Linux kernel functionality should verify and apply kernel updates to ensure data integrity. The vulnerability's scope and impact require further verification.

• Verify data integrity after file modifications
• Ensure proper kernel updates are applied
• Monitor for potential data inconsistencies

Technical summary

The Linux kernel vulnerability CVE-2026-93794 occurs when punching a hole in a file, allowing dirty data to be reported as present due to inadequate flushing of dirty data before hole creation. This happens because a dirty folio spanning the punched range can be written back after the punch and refill the hole. To address this issue, verify and apply kernel updates to ensure data integrity. Linux system administrators and users with file systems relying on Linux kernel functionality should take necessary precautions.

Defensive priority

Verify and apply kernel updates to ensure data integrity

Recommended defensive actions

• Verify Linux kernel versions and apply updates if necessary
• Review file system configurations for data integrity
• Monitor for potential data inconsistencies
• 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.
• 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.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but its scope and impact require further verification. Linux system administrators and users with file systems relying on Linux kernel functionality should verify and apply kernel updates to ensure data integrity. The vulnerability allows data to be reported as present after punching a hole in a file, due to dirty data not being flushed before hole creation.

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.