An issue was discovered in drivers/bluetooth/hci_ldisc.c in the Linux kernel 6.2. In hci_uart_tty_ioctl, there is a race condition between HCIUARTSETPROTO and HCIUARTGETPROTO. HCI_UART_PROTO_SET is set before hu->proto is set. A NULL pointer dereference may occur. CREATE(Triage):(User=admin) CVE-2023-31083 (https://nvd.nist.gov/vuln/detail/CVE-2023-31083)
