CVE-2026-72335 — Bluetooth: MGMT: Fix adv monitor add failure cleanup

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: MGMT: Fix adv monitor add failure cleanup

hci_add_adv_monitor() publishes a new adv_monitor in hdev->adv_monitors_idr before the powered MSFT setup step. The MSFT offload add path can then fail either locally before the controller add command completes, or in the MSFT add callback. In the current queued management add flow, hci_cmd_sync_work() still invokes mgmt_add_adv_patterns_monitor_complete() with the original pending command after msft_add_monitor_pattern() returns.

The buggy scenario involves two paths, with each column showing the order within that path:

MSFT add handling MGMT completion 1. insert monitor and handle 1. receive sync error 2. send MSFT add command 2. call add-monitor completion 3. callback sees bad response 3. load cmd->user_data 4. callback frees monitor 4. read monitor->handle

Local MSFT setup failures have the other half of the same ownership bug: they return an error after the IDR insertion, but no later code removes the failed monitor from the IDR.

Keep ownership with the pending management command until its completion. For normal management adds, the MSFT add callback now records successful controller state and returns errors to its caller. The management completion frees the monitor on non-success after copying the response handle, while resume/reregister callback-error cleanup remains in the MSFT callback. The succ…

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CVE-2026-72335 — Bluetooth: MGMT: Fix adv monitor add failure cleanup