{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23146", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.974Z", "datePublished": "2026-02-14T16:01:16.169Z", "dateUpdated": "2026-02-14T16:01:16.169Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-02-14T16:01:16.169Z"}, "descriptions": [{"lang": "en", "value": "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->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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/bluetooth/hci_ldisc.c"], "versions": 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"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"}], "title": "Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work", "x_generator": {"engine": "bippy-1.2.0"}}}}

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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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: hci_uart: correcci\u00f3n de desreferencia de puntero nulo en hci_uart_write_work\n\nhci_uart_set_proto() establece HCI_UART_PROTO_INIT antes de llamar a hci_uart_register_dev(), que llama a proto->open() para inicializar hu->priv. Sin embargo, si una activaci\u00f3n de escritura TTY ocurre durante esta ventana, hci_uart_tx_wakeup() puede programar write_work antes de que hu->priv sea inicializado, lo que lleva a una desreferencia de puntero NULL en hci_uart_write_work() cuando proto->dequeue() accede a hu->priv.\n\nLa condici\u00f3n de carrera es:\n\n CPU0 CPU1\n ---- ----\n hci_uart_set_proto()\n set_bit(HCI_UART_PROTO_INIT)\n hci_uart_register_dev()\n activaci\u00f3n de escritura tty\n hci_uart_tty_wakeup()\n hci_uart_tx_wakeup()\n schedule_work(&hu->write_work)\n proto->open(hu)\n // inicializa hu->priv\n hci_uart_write_work()\n hci_uart_dequeue()\n proto->dequeue(hu)\n // accede a hu->priv (\u00a1NULL!)\n\nEsto se soluciona moviendo set_bit(HCI_UART_PROTO_INIT) despu\u00e9s de que proto->open() se complete con \u00e9xito, asegurando que hu->priv est\u00e9 inicializado antes de que se pueda programar cualquier trabajo."}], "id": "CVE-2026-23146", "lastModified": "2026-03-17T21:13:01.070", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-02-14T16:15:54.703", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/03e8c90c62233382042b7bd0fa8b8900552fdb62"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0c3cd7a0b862c37acbee6d9502107146cc944398"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/186d147cf7689ba1f9b3ddb753ab634a84940cc9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/53e54cb31e667fca05b1808b990eac0807d1dab0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/937a573423ce5a96fdb1fd425dc6b8d8d4ab5779"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b0a900939e7e4866d9b90e9112514b72c451e873"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ccc683f597ceb28deb966427ae948e5ac739a909"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: Bluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work", "id": "2439882", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2439882"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nBluetooth: hci_uart: fix null-ptr-deref in hci_uart_write_work\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.\nThe race condition is:\nCPU0 CPU1\n---- ----\nhci_uart_set_proto()\nset_bit(HCI_UART_PROTO_INIT)\nhci_uart_register_dev()\ntty write wakeup\nhci_uart_tty_wakeup()\nhci_uart_tx_wakeup()\nschedule_work(&hu->write_work)\nproto->open(hu)\n// initializes hu->priv\nhci_uart_write_work()\nhci_uart_dequeue()\nproto->dequeue(hu)\n// accesses hu->priv (NULL!)\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."], "name": "CVE-2026-23146", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-14T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23146\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23146\nhttps://lore.kernel.org/linux-cve-announce/2026021411-CVE-2026-23146-3658@gregkh/T"], "threat_severity": "Important"}

{"created": "2026-02-16T12:01:21.033368+00:00", "updated": "2026-02-16T12:01:21.033468+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}