CVE-2026-23146

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work

hci_uart_set_proto() sets HCI_UART_PROTO_INIT before calling

hci_uart_register_dev(), which calls proto->open() to initialize

hu->priv. However, if a TTY write wakeup occurs during this window,

hci_uart_tx_wakeup() may schedule write_work before hu->priv is

initialized, leading to a NULL pointer dereference in

hci_uart_write_work() when proto->dequeue() accesses hu->priv.

The race condition is:

CPU0 CPU1

---- ----

hci_uart_set_proto()

set_bit(HCI_UART_PROTO_INIT)

hci_uart_register_dev()

tty write wakeup

hci_uart_tty_wakeup()

hci_uart_tx_wakeup()

schedule_work(&hu->write_work)

proto->open(hu)

// initializes hu->priv

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References