CVE-2026-64333 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution vendors, and users of Linux systems with USB serial digi_acceleport devices should be aware of this vulnerability and take steps to ensure their systems are updated. Affected operator, platform, vulnerability-management, and security-team impact should be carefully reviewed.

Technical summary

The digi_write_inb_command() function in the Linux kernel's USB serial digi_acceleport driver did not properly handle write urb timeouts. Instead of returning an error or waiting for the urb to become available, it updated the transfer buffer and tried to resubmit the urb on timeout. Additionally, for commands like break control where no timeout is used, the driver would corrupt the urb immediately due to a broken jiffies comparison. This issue has been fixed by adding a missing return on timeout and waiting indefinitely when no timeout has been specified.

Defensive priority

Medium

Recommended defensive actions

• Update Linux kernel to the latest version
• Verify and apply vendor patches
• Monitor system logs for potential issues
• 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-25T10:17:15.080Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about this vulnerability, and defenders should verify the affected scope and severity with the official CVE record and vendor guidance.

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.