CVE-2026-23146

MEDIUM EPSS 2.4%
Published Feb 14, 20264mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 14, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 15

VendorProductVersionRange
linuxlinux_kernel*≥5.4.293  –  <5.5
linuxlinux_kernel*≥5.10.237  –  <5.10.249
linuxlinux_kernel*≥5.15.181  –  <5.15.199
linuxlinux_kernel*≥6.1.135  –  <6.1.162
linuxlinux_kernel*≥6.6.88  –  <6.6.123
linuxlinux_kernel*≥6.12.24  –  <6.12.69
linuxlinux_kernel*≥6.13.12  –  <6.14
linuxlinux_kernel*≥6.14.3  –  <6.18.9
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any

References 7

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

Remediation

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