{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-46275", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-46275", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-06-08T14:30:54.232Z", "updatedAt": "2026-10-19T19:36:56.765Z", "importedAt": "2026-10-24T01:58:14.884Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "Bluetooth: hci_uart: fix UAFs and race conditions in close and init paths", "summary": "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.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "status": "affected", "versionType": "git", "lessThan": "78aad93e938f013d9272fe0ee168f27883afa95c" }, { "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "status": "affected", "versionType": "git", "lessThan": "e2d19969c8d9198ecc3090bcd5312ecd503a3339" }, { "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "status": "affected", "versionType": "git", "lessThan": "c85cff648a2bc92322912db5f1727ad05afae7b6" }, { "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "status": "affected", "versionType": "git", "lessThan": "9d20d48be2c4a071fb015eb09bda2cecd25daf34" }, { "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "status": "affected", "versionType": "git", "lessThan": "81c7a3c22a0f2808cf4ae0b4908f59763b23606d" }, { "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "status": "affected", "versionType": "git", "lessThan": "192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894" }, { "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "status": "affected", "versionType": "git", "lessThan": "7338031946bd06f6dff149e67b60c4cd083bfea8" }, { "version": "3b799254cf6f481460719023d7a18f46651e5e7f", "status": "affected", "versionType": "git", "lessThan": "c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b" }, { "version": "cd27019bc149f20f12ebec943c2b4c775745a5a0", "status": "affected", "versionType": "git" }, { "version": "aea63181b6fcb6b9ccde1ada9ea51be19c4015af", "status": "affected", "versionType": "git" }, { "version": "0d234d1135dcd8876de0576dac68efd0a87eef87", "status": "affected", "versionType": "git" }, { "version": "3fe978892ab46efc2f3830d9abc015eff72caaf9", "status": "affected", "versionType": "git" }, { "version": "0d987e14bebaf0f67ee7dbefaf6165c62cd1d27f", "status": "affected", "versionType": "git" }, { "version": "4.14.203", "status": "affected", "versionType": "semver", "lessThan": "4.15" }, { "version": "4.19.153", "status": "affected", "versionType": "semver", "lessThan": "4.20" }, { "version": "5.4.73", "status": "affected", "versionType": "semver", "lessThan": "5.5" }, { "version": "5.8.17", "status": "affected", "versionType": "semver", "lessThan": "5.9" }, { "version": "5.9.2", "status": "affected", "versionType": "semver", "lessThan": "5.10" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.10" }, { "version": "5.10.258", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.209", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.175", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.142", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.92", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.34", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.0.11", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.0.*" }, { "version": "7.1", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }