Linux Kernel Vulnerability in USB Type-C UCSI Debugfs Entries Management

CVE-2026-100079

What is CVE-2026-100079?

This vulnerability in the Linux kernel affects the management of debugfs entries related to the USB Type-C UCSI (USB Type-C Connector System Interface) when registering and unregistering instances. The function ucsi_register() creates debugfs entries for each UCSI instance; however, when ucsi_unregister() is called, it does not remove these entries until ucsi_destroy() is executed. This can lead to scenarios where drivers like ucsi_glink attempt to re-register an already existing debugfs directory after a remoteproc restart, resulting in errors such as 'debugfs: pmic_glink.ucsi.0 already exists in ucsi'. This oversight creates unsafe conditions during repeated unregister calls, highlighting the need for proper cleanup of debugfs entries to enhance the robustness of driver management procedures.

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