Bluetooth: hci_conn: fix the SCO setup context lifetime

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.

Timeline

1. Sep 17, 2026, 4:07 PM UTCCVE published
2. Oct 19, 2026, 9:00 AM UTCRecord last updated

Affected versions

• Linux Linux

  From e07a06b4eb417f5271d33ce2240e93c62d98b7b4 · fixed in 37cfec41365c826d5496ef5d00c9e215eee53aa2; From e07a06b4eb417f5271d33ce2240e93c62d98b7b4 · fixed in 9a2ba69cebe3fc5a3d4fa8eaaad3c42862723c27; From e07a06b4eb417f5271d33ce2240e93c62d98b7b4 · fixed in a661de0ee29d0915c5e924edf91d2be2b4d35bae; From e07a06b4eb417f5271d33ce2240e93c62d98b7b4 · fixed in c1fe3c74a89a7749cba3caa0dd91236049c66116; From e07a06b4eb417f5271d33ce2240e93c62d98b7b4 · fixed in 4d7b1c834d2775b73c65e4888e01f5af8b477fe9; From e07a06b4eb417f5271d33ce2240e93c62d98b7b4 · fixed in 42de40abe25db9211107af8896d0fd741f10648d

• Linux Linux

  6.1

• KernelLinux

  From 6.1.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 6