CVE-2026-46275

{"id": "CVE-2026-46275", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "lessThan": "78aad93e938f013d9272fe0ee168f27883afa95c", "versionType": "git"}, {"status": "affected", "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "lessThan": "e2d19969c8d9198ecc3090bcd5312ecd503a3339", "versionType": "git"}, {"status": "affected", "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "lessThan": "c85cff648a2bc92322912db5f1727ad05afae7b6", "versionType": "git"}, {"status": "affected", "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "lessThan": "9d20d48be2c4a071fb015eb09bda2cecd25daf34", "versionType": "git"}, {"status": "affected", "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "lessThan": "81c7a3c22a0f2808cf4ae0b4908f59763b23606d", "versionType": "git"}, {"status": "affected", "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "lessThan": "192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894", "versionType": "git"}, {"status": "affected", "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "lessThan": "7338031946bd06f6dff149e67b60c4cd083bfea8", "versionType": "git"}, {"status": "affected", "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "lessThan": "c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b", "versionType": "git"}, {"status": "affected", "version": "cd27019bc149f20f12ebec943c2b4c775745a5a0", "versionType": "git"}, {"status": "affected", "version": "aea63181b6fcb6b9ccde1ada9ea51be19c4015af", "versionType": "git"}, {"status": "affected", "version": "0d234d1135dcd8876de0576dac68efd0a87eef87", "versionType": "git"}, {"status": "affected", "version": "3fe978892ab46efc2f3830d9abc015eff72caaf9", "versionType": "git"}, {"status": "affected", "version": "0d987e14bebaf0f67ee7dbefaf6165c62cd1d27f", "versionType": "git"}, {"status": "affected", "version": "4.14.203", "lessThan": "4.15", "versionType": "semver"}, {"status": "affected", "version": "4.19.153", "lessThan": "4.20", "versionType": "semver"}, {"status": "affected", "version": "5.4.73", "lessThan": "5.5", "versionType": "semver"}, {"status": "affected", "version": "5.8.17", "lessThan": "5.9", "versionType": "semver"}, {"status": "affected", "version": "5.9.2", "lessThan": "5.10", "versionType": "semver"}], "programFiles": ["drivers/bluetooth/hci_ldisc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"status": "unaffected", "version": "0", "lessThan": "5.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.142", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.92", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.34", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.11", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/bluetooth/hci_ldisc.c"], "defaultStatus": "affected"}]}], "published": "2026-06-08T16:16:40.863", "references": [{"url": "https://git.kernel.org/stable/c/192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7338031946bd06f6dff149e67b60c4cd083bfea8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/78aad93e938f013d9272fe0ee168f27883afa95c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/81c7a3c22a0f2808cf4ae0b4908f59763b23606d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9d20d48be2c4a071fb015eb09bda2cecd25daf34", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c85cff648a2bc92322912db5f1727ad05afae7b6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e2d19969c8d9198ecc3090bcd5312ecd503a3339", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-362"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_uart: fix UAFs and race conditions in close and init paths\n\nVulnerabilities leading to Use-After-Free (UAF) and Null Pointer\nDereference (NPD) conditions were observed in the lifecycle management\nof hci_uart.\n\nThe primary issue arises because the workqueues (init_ready and\nwrite_work) are only flushed/cancelled if the HCI_UART_PROTO_READY\nflag is set during TTY close. If a hangup occurs before setup completes,\nhci_uart_tty_close() skips the teardown of these workqueues and\nproceeds to free the `hu` struct. When the scheduled work executes\nlater, it blindly dereferences the freed `hu` struct.\n\nFurthermore, several data races and UAFs were identified in the teardown\nsequence:\n1. Calling hci_uart_flush() from hci_uart_close() without effectively\n disabling write_work causes a race condition where both can concurrently\n double-free hu->tx_skb. This happens because protocol timers can\n concurrently invoke hci_uart_tx_wakeup() and requeue write_work.\n2. Calling hci_free_dev(hdev) before hu->proto->close(hu) causes a UAF\n when vendor specific protocol close callbacks dereference hu->hdev.\n3. In the initialization error paths, failing to take the proto_lock\n write lock before clearing PROTO_READY leads to races with active\n readers. Additionally, hci_uart_tty_receive() accesses hu->hdev\n outside the read lock, leading to UAFs if the initialization error\n path frees hdev concurrently.\n\nFix these synchronization and lifecycle issues by:\n1. Re-ordering hci_uart_tty_close() to clear HCI_UART_PROTO_READY first,\n followed immediately by a cancel_work_sync(&hu->write_work). Clearing\n the flag locks out concurrent protocol timers from successfully invoking\n hci_uart_tx_wakeup(), effectively rendering the cancellation permanent\n and preventing the tx_skb double-free.\n2. Note: Clearing PROTO_READY early causes hci_uart_close() to skip\n hu->proto->flush(). This is perfectly safe in the tty_close path\n because hu->proto->close() executes shortly after, which intrinsically\n purges all protocol SKB queues and tears down the state.\n3. Relocating hu->proto->close(hu) strictly prior to hci_free_dev(hdev)\n across all close and error paths to prevent vendor-level UAFs.\n4. Moving the hdev->stat.byte_rx increment in hci_uart_tty_receive()\n inside the proto_lock read-side critical section to safely synchronize\n with device unregistration.\n5. Adding cancel_work_sync(&hu->write_work) to hci_uart_close() to safely\n flush the workqueue before hci_uart_flush() is invoked via the HCI core.\n6. Utilizing cancel_work_sync() instead of disable_work_sync() across\n all paths to prevent permanently breaking user-space retry capabilities."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: hci_uart: corrige UAFs y condiciones de carrera en las rutas de cierre e inicializaci\u00f3n\n\nSe observaron vulnerabilidades que conducen a condiciones de Uso Despu\u00e9s de Liberaci\u00f3n (UAF) y Desreferencia de Puntero Nulo (NPD) en la gesti\u00f3n del ciclo de vida de hci_uart.\n\nEl problema principal surge porque las colas de trabajo (workqueues) (init_ready y write_work) solo se vac\u00edan/cancelan si la bandera HCI_UART_PROTO_READY est\u00e1 establecida durante el cierre de TTY. Si ocurre un cuelgue antes de que se complete la configuraci\u00f3n, hci_uart_tty_close() omite la desinstalaci\u00f3n de estas colas de trabajo y procede a liberar la estructura 'hu'. Cuando el trabajo programado se ejecuta m\u00e1s tarde, desreferencia ciegamente la estructura 'hu' liberada.\n\nAdem\u00e1s, se identificaron varias condiciones de carrera de datos y UAFs en la secuencia de desinstalaci\u00f3n:\n1. Llamar a hci_uart_flush() desde hci_uart_close() sin deshabilitar efectivamente write_work causa una condici\u00f3n de carrera donde ambos pueden liberar doblemente hu->tx_skb de forma concurrente. Esto sucede porque los temporizadores del protocolo pueden invocar concurrentemente hci_uart_tx_wakeup() y volver a encolar write_work.\n2. Llamar a hci_free_dev(hdev) antes de hu->proto->close(hu) causa un UAF cuando las devoluciones de llamada de cierre del protocolo espec\u00edfico del proveedor desreferencian hu->hdev.\n3. En las rutas de error de inicializaci\u00f3n, no tomar el bloqueo de escritura proto_lock antes de borrar PROTO_READY conduce a condiciones de carrera con lectores activos. Adem\u00e1s, hci_uart_tty_receive() accede a hu->hdev fuera del bloqueo de lectura, lo que lleva a UAFs si la ruta de error de inicializaci\u00f3n libera hdev concurrentemente.\n\nCorregir estos problemas de sincronizaci\u00f3n y ciclo de vida mediante:\n1. Reordenar hci_uart_tty_close() para borrar HCI_UART_PROTO_READY primero, seguido inmediatamente por un cancel_work_sync(&hu->write_work). Borrar la bandera bloquea a los temporizadores del protocolo concurrentes para que no invoquen con \u00e9xito hci_uart_tx_wakeup(), haciendo que la cancelaci\u00f3n sea permanente y evitando la doble liberaci\u00f3n de tx_skb.\n2. Nota: Borrar PROTO_READY temprano hace que hci_uart_close() omita hu->proto->flush(). Esto es perfectamente seguro en la ruta tty_close porque hu->proto->close() se ejecuta poco despu\u00e9s, lo que intr\u00ednsecamente purga todas las colas SKB del protocolo y desinstala el estado.\n3. Reubicar hu->proto->close(hu) estrictamente antes de hci_free_dev(hdev) en todas las rutas de cierre y error para prevenir UAFs a nivel de proveedor.\n4. Mover el incremento de hdev->stat.byte_rx en hci_uart_tty_receive() dentro de la secci\u00f3n cr\u00edtica del lado de lectura de proto_lock para sincronizar de forma segura con la anulaci\u00f3n del registro del dispositivo.\n5. A\u00f1adir cancel_work_sync(&hu->write_work) a hci_uart_close() para vaciar de forma segura la cola de trabajo antes de que hci_uart_flush() sea invocado a trav\u00e9s del n\u00facleo HCI.\n6. Utilizar cancel_work_sync() en lugar de disable_work_sync() en todas las rutas para evitar romper permanentemente las capacidades de reintento del espacio de usuario."}], "lastModified": "2026-07-23T07:10:00.113", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "27A7D190-0093-49D0-BC13-C06D04205CB3", "versionEndExcluding": "4.15", "versionStartIncluding": "4.14.203"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F9F8E966-D84B-4A94-8A67-E1B47A05557F", "versionEndExcluding": "4.20", "versionStartIncluding": "4.19.153"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "886AB560-B760-44F0-AD89-3F275E4C0F58", "versionEndExcluding": "5.5", "versionStartIncluding": "5.4.73"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BEFC3ACE-365D-48E7-9C0A-019C74CC0725", "versionEndExcluding": "5.9", "versionStartIncluding": "5.8.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "38EA52EA-57DE-4180-953C-1512932A936A", "versionEndExcluding": "5.10.258", "versionStartIncluding": "5.9.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "919C10A9-7951-4A74-BADD-C135A0A8D8B4", "versionEndExcluding": "5.15.209", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "92385813-D91D-480D-83A1-F423D2CBB2BA", "versionEndExcluding": "6.1.175", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FBFF77B0-526A-4AF1-84D0-ED7187624A67", "versionEndExcluding": "6.6.142", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9CB90BD9-95B7-4D7F-9F17-4ECE6CFB66C9", "versionEndExcluding": "6.12.92", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A4B1EF6D-18D7-4838-BC37-7499D5DCC3C0", "versionEndExcluding": "6.18.34", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0520D091-FC52-4A50-AF07-70AE7D08B750", "versionEndExcluding": "7.0.11", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}