{"id":"CVE-2026-23146","title":"Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work\n\nhci_uart_set_proto() sets HCI_UART_PROTO_INIT before calling\nhci_uart_register_dev(), which calls proto-…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= a40f94f7caa8d3421b64f63ac31bc0f24c890f39 < b0a900939e7e4866d9b90e9112514b72c451e873","Linux >= 9e5a0f5777162e503400c70c6ed25fbbe2d38799 < ccc683f597ceb28deb966427ae948e5ac739a909","Linux >= 80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 < 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779","Linux >= 02e1bcdfdf769974e7e9fa285e295cd9852e2a38 < 186d147cf7689ba1f9b3ddb753ab634a84940cc9","Linux >= 281782d2c6730241e300d630bb9f200d831ede71 < 53e54cb31e667fca05b1808b990eac0807d1dab0","Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 03e8c90c62233382042b7bd0fa8b8900552fdb62","Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 0c3cd7a0b862c37acbee6d9502107146cc944398","Linux 1dcf08fcff5ca529de6dc0395091f28854f4e54a","Linux 8e5aff600539e5faea294d9612cca50220e602b8","Linux db7509fa110dd9b11134b75894677f30353b2c51","Linux >= 5.10.237 < 5.10.249","Linux >= 5.15.181 < 5.15.199","Linux >= 6.1.135 < 6.1.162","Linux >= 6.6.88 < 6.6.123","Linux >= 6.12.24 < 6.12.69","Linux >= 5.4.293 < 5.5","Linux >= 6.13.12 < 6.14","Linux >= 6.14.3 < 6.15","Linux 6.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T20:41:53.104941Z"},"published":"2026-02-14","updated":"2026-10-19","sourceUpdated":"2026-10-19T18:25:33.428Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23146","references":[{"url":"https://git.kernel.org/stable/c/b0a900939e7e4866d9b90e9112514b72c451e873"},{"url":"https://git.kernel.org/stable/c/ccc683f597ceb28deb966427ae948e5ac739a909"},{"url":"https://git.kernel.org/stable/c/937a573423ce5a96fdb1fd425dc6b8d8d4ab5779"},{"url":"https://git.kernel.org/stable/c/186d147cf7689ba1f9b3ddb753ab634a84940cc9"},{"url":"https://git.kernel.org/stable/c/53e54cb31e667fca05b1808b990eac0807d1dab0"},{"url":"https://git.kernel.org/stable/c/03e8c90c62233382042b7bd0fa8b8900552fdb62"},{"url":"https://git.kernel.org/stable/c/0c3cd7a0b862c37acbee6d9502107146cc944398"}],"tags":["cve.org"],"epss":0.00144,"epssPercentile":0.033,"ingestedAt":"2026-10-19T18:35:50.100Z","slug":"CVE-2026-23146","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work\n\nhci_uart_set_proto() sets HCI_UART_PROTO_INIT before calling\nhci_uart_register_dev(), which calls proto->open() to initialize\nhu->priv. However, if a TTY write wakeup occurs during this window,\nhci_uart_tx_wakeup() may schedule write_work before hu->priv is\ninitialized, leading to a NULL pointer dereference in\nhci_uart_write_work() when proto->dequeue() accesses hu->priv.\n\nThe race condition is:\n\n  CPU0                              CPU1\n  ----                              ----\n  hci_uart_set_proto()\n    set_bit(HCI_UART_PROTO_INIT)\n    hci_uart_register_dev()\n                                    tty write wakeup\n                                      hci_uart_tty_wakeup()\n                                        hci_uart_tx_wakeup()\n                                          schedule_work(&hu->write_work)\n      proto->open(hu)\n        // initializes hu->priv\n                                    hci_uart_write_work()\n                                      hci_uart_dequeue()\n                                        proto->dequeue(hu)\n                                          // accesses hu->priv (NULL!)\n\nFix this by moving set_bit(HCI_UART_PROTO_INIT) after proto->open()\nsucceeds, ensuring hu->priv is initialized before any work can be\nscheduled.\n\n## Affected\n\n- `Linux >= a40f94f7caa8d3421b64f63ac31bc0f24c890f39 < b0a900939e7e4866d9b90e9112514b72c451e873`\n- `Linux >= 9e5a0f5777162e503400c70c6ed25fbbe2d38799 < ccc683f597ceb28deb966427ae948e5ac739a909`\n- `Linux >= 80f14e9de6a43a0bd8194cad1003a3e6dcbc3984 < 937a573423ce5a96fdb1fd425dc6b8d8d4ab5779`\n- `Linux >= 02e1bcdfdf769974e7e9fa285e295cd9852e2a38 < 186d147cf7689ba1f9b3ddb753ab634a84940cc9`\n- `Linux >= 281782d2c6730241e300d630bb9f200d831ede71 < 53e54cb31e667fca05b1808b990eac0807d1dab0`\n- `Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 03e8c90c62233382042b7bd0fa8b8900552fdb62`\n- `Linux >= 5df5dafc171b90d0b8d51547a82657cd5a1986c7 < 0c3cd7a0b862c37acbee6d9502107146cc944398`\n- `Linux 1dcf08fcff5ca529de6dc0395091f28854f4e54a`\n- `Linux 8e5aff600539e5faea294d9612cca50220e602b8`\n- `Linux db7509fa110dd9b11134b75894677f30353b2c51`\n- `Linux >= 5.10.237 < 5.10.249`\n- `Linux >= 5.15.181 < 5.15.199`\n- `Linux >= 6.1.135 < 6.1.162`\n- `Linux >= 6.6.88 < 6.6.123`\n- `Linux >= 6.12.24 < 6.12.69`\n- `Linux >= 5.4.293 < 5.5`\n- `Linux >= 6.13.12 < 6.14`\n- `Linux >= 6.14.3 < 6.15`\n- `Linux 6.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}