CVE-2026-23146

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

State: Published
Severity: Not scored
Published: Feb 14, 2026
Updated: Oct 19, 2026
Reserved: Jan 13, 2026

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 hci_uart_write_work() hci_uart_dequeue() proto->dequeue(hu) // accesses hu->priv (NULL!)

Fix this by moving set_bit(HCI_UART_PROTO_INIT) after proto->open() succeeds, ensuring hu->priv is initialized before any work can be scheduled.

Scores

The record has no CVSS score.

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
LinuxLinux	a40f94f7caa8d3421b64f63ac31bc0f24c890f39 to before b0a900939e7e4866d9b90e9112514b72c451e873Affected 9e5a0f5777162e503400c70c6ed25fbbe2d38799 to before ccc683f597ceb28deb966427ae948e5ac739a909Affected 80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 to before 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779Affected 02e1bcdfdf769974e7e9fa285e295cd9852e2a38 to before 186d147cf7689ba1f9b3ddb753ab634a84940cc9Affected 281782d2c6730241e300d630bb9f200d831ede71 to before 53e54cb31e667fca05b1808b990eac0807d1dab0Affected 5df5dafc171b90d0b8d51547a82657cd5a1986c7 to before 03e8c90c62233382042b7bd0fa8b8900552fdb62Affected 5df5dafc171b90d0b8d51547a82657cd5a1986c7 to before 0c3cd7a0b862c37acbee6d9502107146cc944398Affected 1dcf08fcff5ca529de6dc0395091f28854f4e54aAffected 8e5aff600539e5faea294d9612cca50220e602b8Affected db7509fa110dd9b11134b75894677f30353b2c51Affected 5.10.237 to before 5.10.249Affected 5.15.181 to before 5.15.199Affected 6.1.135 to before 6.1.162Affected 6.6.88 to before 6.6.123Affected 6.12.24 to before 6.12.69Affected 5.4.293 to before 5.5Affected 6.13.12 to before 6.14Affected 6.14.3 to before 6.15Affected
LinuxLinux	6.15Affected before 6.15Not affected 5.10.249 through 5.10.Not affected 5.15.199 through 5.15.Not affected 6.1.162 through 6.1.Not affected 6.6.123 through 6.6.Not affected 6.12.69 through 6.12.Not affected 6.18.9 through 6.18.Not affected 6.19 and laterNot affected

Product

Versions

LinuxLinux

a40f94f7caa8d3421b64f63ac31bc0f24c890f39 to before b0a900939e7e4866d9b90e9112514b72c451e873Affected
9e5a0f5777162e503400c70c6ed25fbbe2d38799 to before ccc683f597ceb28deb966427ae948e5ac739a909Affected
80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 to before 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779Affected
02e1bcdfdf769974e7e9fa285e295cd9852e2a38 to before 186d147cf7689ba1f9b3ddb753ab634a84940cc9Affected
281782d2c6730241e300d630bb9f200d831ede71 to before 53e54cb31e667fca05b1808b990eac0807d1dab0Affected
5df5dafc171b90d0b8d51547a82657cd5a1986c7 to before 03e8c90c62233382042b7bd0fa8b8900552fdb62Affected
5df5dafc171b90d0b8d51547a82657cd5a1986c7 to before 0c3cd7a0b862c37acbee6d9502107146cc944398Affected
1dcf08fcff5ca529de6dc0395091f28854f4e54aAffected
8e5aff600539e5faea294d9612cca50220e602b8Affected
db7509fa110dd9b11134b75894677f30353b2c51Affected
5.10.237 to before 5.10.249Affected
5.15.181 to before 5.15.199Affected
6.1.135 to before 6.1.162Affected
6.6.88 to before 6.6.123Affected
6.12.24 to before 6.12.69Affected
5.4.293 to before 5.5Affected
6.13.12 to before 6.14Affected
6.14.3 to before 6.15Affected

LinuxLinux

6.15Affected
before 6.15Not affected
5.10.249 through 5.10.*Not affected
5.15.199 through 5.15.*Not affected
6.1.162 through 6.1.*Not affected
6.6.123 through 6.6.*Not affected
6.12.69 through 6.12.*Not affected
6.18.9 through 6.18.*Not affected
6.19 and laterNot affected

References

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