CVE-2026-90255

Summary

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

Bluetooth: hci_conn: fix the SCO setup context lifetime

hci_setup_sync() queues a conn_handle_t with a NULL destroy callback, so the context is only freed if hci_enhanced_setup_sync() actually runs. An entry that is cancelled instead 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.

The context also stores a bare hci_conn pointer, so the connection can be freed while the work is queued. The dequeue in hci_conn_del() does not cover it either, as it matches on entry->data == conn and entry->data is the wrapper here. Same problem as commit 2f5d635ad590 ("Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks").

Hold the connection and release both from a destroy callback. The submission failure path drops both, since hci_cmd_sync_submit() does not call the destroy callback when it fails to queue.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/37cfec41365c826d5496ef5d00c9e215eee53aa2
• https://git.kernel.org/stable/c/9a2ba69cebe3fc5a3d4fa8eaaad3c42862723c27
• https://git.kernel.org/stable/c/a661de0ee29d0915c5e924edf91d2be2b4d35bae
• https://git.kernel.org/stable/c/c1fe3c74a89a7749cba3caa0dd91236049c66116
• https://git.kernel.org/stable/c/4d7b1c834d2775b73c65e4888e01f5af8b477fe9
• https://git.kernel.org/stable/c/42de40abe25db9211107af8896d0fd741f10648d

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