CVE-2026-64344 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution vendors, and users of Linux systems who utilize the USB idmouse driver should be aware of this vulnerability and ensure they apply the necessary patches to mitigate the risk. Affected operators and platforms should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

The Linux kernel's USB idmouse driver was vulnerable to a use-after-free issue on disconnect race due to the incorrect use of mutex_unlock() for managing object lifetimes. The fix involves using a kref for releasing driver data to prevent use-after-free scenarios. This vulnerability has been resolved in the Linux kernel, and users should apply the necessary patches to mitigate the risk. The issue arises from the improper use of mutex_unlock() to manage the lifetime of objects, which can lead to accessing the mutex structure after the lock has been released.

Defensive priority

Medium

Recommended defensive actions

• Apply the official patch to update the Linux kernel's USB idmouse driver
• Review and update Linux kernel versions to ensure the fix is included
• Monitor Linux distribution advisories for patched versions
• 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 2026-07-25T10:17:16.487Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the official advisory. The Linux kernel's USB idmouse driver vulnerability was resolved by utilizing a kref to release the driver data, thereby preventing use-after-free when the release() function races with disconnect().

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.