CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's xHCI driver, specifically in the handling of the tty_register_driver() function, which can lead to a use-after-free condition due to improper management of the dbc_tty_driver pointer. If the driver registration fails, the reference is dropped without nullifying the global pointer, resulting in potential system instability during module unload. Linux system administrators and developers working with kernel modules should prioritize addressing this issue to prevent exploitation and ensure system integrity.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: xhci: dbgtty: Fix unregister on tty_register_driver() failure If tty_register_driver() fails, it drops the reference, but fails to set the global dbc_tty_driver to NULL, causing the unregister to be called again when module exits. On module unload dbc_tty_exit() only gates its cleanup on the driver pointer being non-NULL, so it operates on the already-freed driver: module_init(xhci_hcd_init) xhci_hcd_init() xhci_dbc_init() [return value ignored] dbc_tty_init() tty_register_driver() fails tty_driver_kref_put() -> driver freed (dbc_tty_driver left dangling) ... module_exit(xhci_hcd_fini) xhci_hcd_fini() xhci_dbc_exit() dbc_tty_exit() if (dbc_tty_driver) -> true (dangling) tty_unregister_driver() -> use-after-free