In the Linux kernel, the following vulnerability has been resolved:
usb: cdc-acm: Check control transfer buffer size before access
If the first fragment is shorter than struct usb_cdc_notification, we cant
calculate an expected_size. Log an error and discard the notification
instead of reading lengths from memory outside the received data, which can
lead to memory corruption when the expected_size decreases between
fragments, causing expected_size - acm->nb_index to wrap.
This issue has been present since the beginning of git history; however, it only leads to memory corruption since commit ea2583529cd1 (cdc-acm: reassemble fragmented notifications).
A mitigating factor is that acm_ctrl_irq() can only execute after userspace has opened /dev/ttyACM*; but if ModemManager is running, ModemManager will do that automatically depending on the USB devices vendor/product IDs and its other interfaces.