CVE-2026-64594 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, users of Linux systems with usb gadget f_fs functionality, system administrators, security teams, and vulnerability management teams should be aware of this vulnerability and take necessary actions to ensure the f_fs reset_work is properly initialized and to review system configurations for usb gadget f_fs usage.

Technical summary

The Linux kernel vulnerability involves the usb gadget f_fs where reset_work is not initialized before being used. This could potentially lead to a warning in __flush_work(). The issue was resolved by initializing reset_work once in ffs_data_new(). Affected product deployments should be reviewed, and owners should be assigned for follow-up. System configurations for usb gadget f_fs usage should be reviewed, and system logs should be monitored for __flush_work() warnings.

Defensive priority

Apply kernel updates to ensure f_fs reset_work is properly initialized.

Recommended defensive actions

• Apply kernel updates to ensure f_fs reset_work is properly initialized
• Review system configurations for usb gadget f_fs usage
• Monitor system logs for __flush_work() warnings
• Perform vulnerability assessment to identify potential exposure
• Implement compensating controls for exposed systems
• Conduct asset inventory to identify affected systems
• Track exceptions and retest remediated assets

Evidence notes

The CVE record and NVD entry provide details on the Linux kernel vulnerability. Limited information is available on affected systems and exploitation. To verify, defenders should review system configurations for usb gadget f_fs usage, monitor system logs for __flush_work() warnings, and apply kernel updates to ensure f_fs reset_work is properly initialized. Evidence is limited, and further verification is required to determine the full scope of the vulnerability.

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.