{"id":"CVE-2026-46275","summary":"Bluetooth: hci_uart: fix UAFs and race conditions in close and init paths","details":"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-\u003etx_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-\u003eproto-\u003eclose(hu) causes a UAF\n   when vendor specific protocol close callbacks dereference hu-\u003ehdev.\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-\u003ehdev\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-\u003ewrite_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-\u003eproto-\u003eflush(). This is perfectly safe in the tty_close path\n   because hu-\u003eproto-\u003eclose() executes shortly after, which intrinsically\n   purges all protocol SKB queues and tears down the state.\n3. Relocating hu-\u003eproto-\u003eclose(hu) strictly prior to hci_free_dev(hdev)\n   across all close and error paths to prevent vendor-level UAFs.\n4. Moving the hdev-\u003estat.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-\u003ewrite_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.","modified":"2026-07-15T01:49:17.975679447Z","published":"2026-06-08T14:30:54.232Z","related":["SUSE-SU-2026:2914-1","openSUSE-SU-2026:11014-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46275.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7338031946bd06f6dff149e67b60c4cd083bfea8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/78aad93e938f013d9272fe0ee168f27883afa95c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/81c7a3c22a0f2808cf4ae0b4908f59763b23606d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d20d48be2c4a071fb015eb09bda2cecd25daf34"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c85cff648a2bc92322912db5f1727ad05afae7b6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e2d19969c8d9198ecc3090bcd5312ecd503a3339"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46275.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46275"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3b799254cf6f481460719023d7a18f46651e5e7f"},{"fixed":"78aad93e938f013d9272fe0ee168f27883afa95c"},{"fixed":"e2d19969c8d9198ecc3090bcd5312ecd503a3339"},{"fixed":"c85cff648a2bc92322912db5f1727ad05afae7b6"},{"fixed":"9d20d48be2c4a071fb015eb09bda2cecd25daf34"},{"fixed":"81c7a3c22a0f2808cf4ae0b4908f59763b23606d"},{"fixed":"192cb0f1ca706d9a1bc36ae0ad5f666d1e4fd894"},{"fixed":"7338031946bd06f6dff149e67b60c4cd083bfea8"},{"fixed":"c1bb9336ae6b54a5f6a353c4bd4ed9a4307e429b"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"cd27019bc149f20f12ebec943c2b4c775745a5a0"},{"last_affected":"aea63181b6fcb6b9ccde1ada9ea51be19c4015af"},{"last_affected":"0d234d1135dcd8876de0576dac68efd0a87eef87"},{"last_affected":"3fe978892ab46efc2f3830d9abc015eff72caaf9"},{"last_affected":"0d987e14bebaf0f67ee7dbefaf6165c62cd1d27f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.203"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.153"},{"fixed":"4.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.73"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.8.17"},{"fixed":"5.9"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.9.2"},{"fixed":"5.10"}]}],"versions":["v5.9","v5.9.1","v5.8.16","v5.4.72","v4.19.152","v5.9-rc1","v4.14.202","v5.9-rc7","v4.14.201","v4.19.151","v5.4.71","v5.8.15","v5.8.14","v5.4.70","v4.19.150","v4.14.200","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.8.13","v5.4.69","v4.19.149","v5.9-rc3","v5.8.12","v5.4.68","v4.19.148","v4.14.199","v5.8.11","v5.4.67","v4.19.147","v5.9-rc2","v5.8.10","v5.4.66","v4.19.146","v4.14.198","v5.8.9","v5.4.65","v4.19.145","v5.8.8","v5.4.64","v4.19.144","v4.14.197","v5.8.7","v5.4.63","v4.19.143","v4.14.196","v5.8.6","v5.4.62","v5.8","v5.8.5","v5.4.61","v4.19.142","v4.14.195","v5.8.4","v5.8.3","v5.4.60","v4.19.141","v4.14.194","v5.8.2","v5.4.59","v4.19.140","v4.14.193","v5.8.1","v5.4.58","v4.19.139","v5.4.57","v4.19.138","v4.14.192","v4.19.137","v5.4.56","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v4.14.191","v4.19.136","v5.4.55","v5.8-rc5","v5.4.54","v4.19.135","v4.14.190","v5.8-rc3","v5.8-rc4","v5.4.53","v4.19.134","v4.14.189","v5.8-rc6","v5.4.52","v4.19.133","v4.14.188","v4.19.132","v5.4.51","v5.4.50","v4.19.131","v4.14.187","v4.19.130","v4.14.186","v5.4.49","v5.7-rc4","v4.14.185","v4.19.129","v5.4.48","v5.4.47","v4.19.128","v4.14.184","v5.4.46","v4.14.183","v4.19.127","v5.4.45","v5.4.44","v4.19.126","v5.7-rc7","v5.7-rc1","v5.4.43","v4.19.125","v4.14.182","v5.7-rc3","v5.7-rc2","v5.7-rc5","v5.4.42","v4.19.124","v4.14.181","v5.7-rc6","v5.4.41","v4.19.123","v4.14.180","v5.4.40","v4.19.122","v5.6","v5.4.39","v4.19.121","v4.14.179","v5.4.38","v4.19.120","v4.14.178","v5.4.37","v4.19.119","v4.14.177","v5.4.36","v5.4.35","v4.19.118","v4.14.176","v5.4.34","v4.19.117","v5.4.33","v4.19.116","v5.4.32","v4.19.115","v5.4.31","v4.19.114","v4.14.175","v5.4.30","v5.6-rc1","v4.14.174","v4.19.113","v5.4.29","v5.4.28","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.4.27","v4.19.112","v5.4.26","v4.19.111","v4.14.173","v5.4.25","v4.19.110","v4.19.109"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