CVE-2026-53073

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_ldisc: Clear HCI_UART_PROTO_INIT on error When hci_register_dev() fails in hci_uart_register_dev() HCI_UART_PROTO_INIT is not cleared before calling hu->proto->close(hu) and setting hu->hdev to NULL. This means incoming UART data will reach the protocol-specific recv handler in hci_uart_tty_receive() after resources are freed. Clear HCI_UART_PROTO_INIT with a write lock before calling hu->proto->close() and setting hu->hdev to NULL. The write lock ensures all active readers have completed and no new reader can enter the protocol recv path before resources are freed. This allows the protocol-specific recv functions to remove the "HCI_UART_REGISTERED" guard without risking a null pointer dereference if hci_register_dev() fails.

References

• https://git.kernel.org/stable/c/194f029a4d7f739e44ebc1f473120187b4de5104
• https://git.kernel.org/stable/c/356dee1bcac4d0d9152390561fa63331ebff211b
• https://git.kernel.org/stable/c/3daa5818e473ed60eb69d8b5c71b651909d28c5a
• https://git.kernel.org/stable/c/68d39ea5e0adc9ecaea1ce8abd842ec972eb8718
• https://git.kernel.org/stable/c/a673cf6c4ac702cb79ac1f4d7fc4de763a6a3e40