{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"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.", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46275" }, { "summary":"CVE-2026-46275 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-46275.json" }, { "summary":"openEuler-SA-2026-3532", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3532" }, { "summary":"CVE-2026-46275", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-46275&packageName=kernel" } ], "title":"openEuler cve CVE-2026-46275", "tracking":{ "initial_release_date":"2026-09-02T09:33:45+08:00", "revision_history":[ { "date":"2026-09-02T09:33:45+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-09-02T09:33:45+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-09-02T09:33:45+08:00", "id":"CVE-2026-46275", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"openEuler-22.03-LTS-SP4", "name":"openEuler-22.03-LTS-SP4" }, "name":"openEuler-22.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"bpftool-5.10.0-330.0.0.231.oe2203sp4.aarch64.rpm", "name":"bpftool-5.10.0-330.0.0.231.oe2203sp4.aarch64.rpm" }, "name":"bpftool-5.10.0-330.0.0.231.oe2203sp4.aarch64.rpm", "category":"product_version" }, { "product":{ 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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.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-330.0.0.231.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-330.0.0.231.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-330.0.0.231.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-330.0.0.231.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-330.0.0.231.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-330.0.0.231.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-330.0.0.231.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-source-5.10.0-330.0.0.231.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-tools-5.10.0-330.0.0.231.oe2203sp4.aarch64", 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"openEuler-22.03-LTS-SP4:perf-5.10.0-330.0.0.231.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:perf-debuginfo-5.10.0-330.0.0.231.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:python3-perf-5.10.0-330.0.0.231.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:python3-perf-debuginfo-5.10.0-330.0.0.231.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-330.0.0.231.oe2203sp4.src" ], "details":"kernel security update", "category":"vendor_fix", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3532" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"HIGH", "baseScore":7.8, "vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version":"3.1" }, "products":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-330.0.0.231.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-330.0.0.231.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-330.0.0.231.oe2203sp4.aarch64", 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"openEuler-22.03-LTS-SP4:perf-debuginfo-5.10.0-330.0.0.231.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:python3-perf-5.10.0-330.0.0.231.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:python3-perf-debuginfo-5.10.0-330.0.0.231.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-330.0.0.231.oe2203sp4.src" ] } ], "threats":[ { "details":"High", "category":"impact" } ], "title":"CVE-2026-46275" } ] }