CVE-2026-90252

/// Technical description

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

Bluetooth: MGMT: free the HCI command when it is cancelled

mgmt_hci_cmd_sync() queues the pending command with a NULL destroy

callback, so it is only freed if send_hci_cmd_sync() runs. A cancelled

entry is leaked, as _hci_cmd_sync_cancel_entry() does not release

entry->data when there is no destroy callback, and hci_cmd_sync_clear()

cancels every pending entry when the controller is unregistered. Nothing

else reclaims it either: mgmt_pending_new() does not put the command on

hdev->mgmt_pending.

The leak also pins the socket reference taken by mgmt_pending_new(), so

the mgmt socket is never released.

Free the command from a destroy callback. The now-empty done label is

replaced by a direct return.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References