CVE-2026-23146 - Vulnerability Details

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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`a40f94f7caa8d3421b64f63ac31bc0f24c890f39`	affected	< b0a900939e7e4866d9b90e9112514b72c451e873
`9e5a0f5777162e503400c70c6ed25fbbe2d38799`	affected	< ccc683f597ceb28deb966427ae948e5ac739a909
`80f14e9de6a43a0bd8194cad1003a3e6dcbc3984`	affected	< 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779
`02e1bcdfdf769974e7e9fa285e295cd9852e2a38`	affected	< 186d147cf7689ba1f9b3ddb753ab634a84940cc9
`281782d2c6730241e300d630bb9f200d831ede71`	affected	< 53e54cb31e667fca05b1808b990eac0807d1dab0
`5df5dafc171b90d0b8d51547a82657cd5a1986c7`	affected	< 03e8c90c62233382042b7bd0fa8b8900552fdb62
`5df5dafc171b90d0b8d51547a82657cd5a1986c7`	affected	< 0c3cd7a0b862c37acbee6d9502107146cc944398
`1dcf08fcff5ca529de6dc0395091f28854f4e54a`	affected	—
`8e5aff600539e5faea294d9612cca50220e602b8`	affected	—
`db7509fa110dd9b11134b75894677f30353b2c51`	affected	—

Linux

affected

Version	Status	Constraints
`6.15`	affected	—
`0`	unaffected	< 6.15
`5.10.249`	unaffected	≤ 5.10.*
`5.15.199`	unaffected	≤ 5.15.*
`6.1.162`	unaffected	≤ 6.1.*
`6.6.123`	unaffected	≤ 6.6.*
`6.12.69`	unaffected	≤ 6.12.*
`6.18.9`	unaffected	≤ 6.18.*
`6.19`	unaffected	≤ *

No data.

Project Subscriptions

Vendors	Products
Linux Subscribe	Linux Kernel Subscribe

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://git.kernel.org/stable/c/03e8c90c62233382042b7bd0fa8b8900552fdb62
https://git.kernel.org/stable/c/0c3cd7a0b862c37acbee6d9502107146cc944398
https://git.kernel.org/stable/c/186d147cf7689ba1f9b3ddb753ab634a84940cc9
https://git.kernel.org/stable/c/53e54cb31e667fca05b1808b990eac0807d1dab0
https://git.kernel.org/stable/c/937a573423ce5a96fdb1fd425dc6b8d8d4ab5779
https://git.kernel.org/stable/c/b0a900939e7e4866d9b90e9112514b72c451e873
https://git.kernel.org/stable/c/ccc683f597ceb28deb966427ae948e5ac739a909

History

Sat, 14 Feb 2026 16:15:00 +0000

Type	Values Removed	Values Added
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.
Title		Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/03e8c90c62233382042b7bd0fa8b8900552fdb62 https://git.kernel.org/stable/c/0c3cd7a0b862c37acbee6d9502107146cc944398 https://git.kernel.org/stable/c/186d147cf7689ba1f9b3ddb753ab634a84940cc9 https://git.kernel.org/stable/c/53e54cb31e667fca05b1808b990eac0807d1dab0 https://git.kernel.org/stable/c/937a573423ce5a96fdb1fd425dc6b8d8d4ab5779 https://git.kernel.org/stable/c/b0a900939e7e4866d9b90e9112514b72c451e873 https://git.kernel.org/stable/c/ccc683f597ceb28deb966427ae948e5ac739a909

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MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-02-14T16:01:16.169Z

Updated: 2026-02-14T16:01:16.169Z

Reserved: 2026-01-13T15:37:45.974Z

Link: CVE-2026-23146

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-02-14T16:15:54.703

Modified: 2026-02-14T16:15:54.703

Link: CVE-2026-23146

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

No weakness.

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