CVE-2026-23146None▾ SunlitIn 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-…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 19.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= a40f94f7caa8d3421b64f63ac31bc0f24c890f39 < b0a900939e7e4866d9b90e9112514b72c451e873Linux >= 9e5a0f5777162e503400c70c6ed25fbbe2d38799 < ccc683f597ceb28deb966427ae948e5ac739a909Linux >= 80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 < 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779Linux >= 02e1bcdfdf769974e7e9fa285e295cd9852e2a38 < 186d147cf7689ba1f9b3ddb753ab634a84940cc9Linux >= 281782d2c6730241e300d630bb9f200d831ede71 < 53e54cb31e667fca05b1808b990eac0807d1dab0Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 03e8c90c62233382042b7bd0fa8b8900552fdb62Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 0c3cd7a0b862c37acbee6d9502107146cc944398Linux 1dcf08fcff5ca529de6dc0395091f28854f4e54aLinux 8e5aff600539e5faea294d9612cca50220e602b8Linux db7509fa110dd9b11134b75894677f30353b2c51Linux >= 5.10.237 < 5.10.249Linux >= 5.15.181 < 5.15.199Linux >= 6.1.135 < 6.1.162Linux >= 6.6.88 < 6.6.123Linux >= 6.12.24 < 6.12.69Linux >= 5.4.293 < 5.5Linux >= 6.13.12 < 6.14Linux >= 6.14.3 < 6.15Linux 6.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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