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CVE-2026-46275 is a Linux kernel vulnerability in the Bluetooth hci_uart subsystem caused by incorrect synchronization and object lifecycle handling in close and initialization paths. The bug affects teardown of the hci_uart context (hu) and associated workqueues (init_ready and write_work). If a TTY hangup occurs before setup completes, hci_uart_tty_close() may skip cancelling or flushing queued work because teardown was gated on the HCI_UART_PROTO_READY flag, then free the hu structure. Deferred work can later execute and dereference the freed hu, resulting in a use-after-free. Additional flaws include a race between hci_uart_flush() and write_work that can double-free hu->tx_skb, incorrect ordering where hci_free_dev(hdev) is called before hu->proto->close(hu) allowing vendor protocol close callbacks to access a freed hu->hdev, and initialization error-path locking issues where PROTO_READY is cleared without the required write lock while hci_uart_tty_receive() accesses hu->hdev outside the read-side critical section. The combined issues can trigger use-after-free, null pointer dereference, and memory corruption conditions in kernel space.
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HCI_UART_PROTO_READY before cancelling write_work, using cancel_work_sync() to flush pending work safely, moving hu->proto->close(hu) before hci_free_dev(hdev) in close and error paths, and correcting locking around PROTO_READY and hu->hdev access in receive and initialization error paths. On Debian stable (trixie), upgrade the linux package to version 6.12.94-1 or later fixed package provided by Debian.No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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