Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER When protocol sets HCI_PROTO_DEFER, hci_conn_request_evt() calls hci_connect_cfm(conn) without hdev->lock. Generally hci_connect_cfm() assumes it is held, and if conn is deleted concurrently -> UAF. Only SCO and ISO set HCI_PROTO_DEFER and only for defer setup listen, and HCI_EV_CONN_REQUEST is not generated for ISO. In the non-deferred listening socket code paths, hci_connect_cfm(conn) is called with hdev->lock held. Fix by holding the lock.

Timeline

1. Jun 24, 2026, 4:30 PM UTCCVE published
2. Oct 16, 2026, 3:25 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 19, 2026, 7:47 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 70c464256310e1c3716099b9d02ece4169272f73 · fixed in 60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4; From 70c464256310e1c3716099b9d02ece4169272f73 · fixed in 9d4a6c0f43fc5e4d4f062e8e450e5483eb74176e; From 70c464256310e1c3716099b9d02ece4169272f73 · fixed in c7777f534a8018ae4bb1c80d8925af4df588a314; From 70c464256310e1c3716099b9d02ece4169272f73 · fixed in 6b4d226d01ab7da0d2027a2a1e3a6079152e5065; From 70c464256310e1c3716099b9d02ece4169272f73 · fixed in 541d5bf9b5afaf41090b2a3aa7b47f2db2ff801f; From 70c464256310e1c3716099b9d02ece4169272f73 · fixed in 385b2d0468a0871fc716c549fa3b0c257c7dbcb3; From 70c464256310e1c3716099b9d02ece4169272f73 · fixed in c27224daf0b08efbb2b24ed64b6139b294f5473a; From 70c464256310e1c3716099b9d02ece4169272f73 · fixed in 5c7209a341ff2ac338b2b0375c34a307b37c9ac2

• Linux Linux

  3.17

• KernelLinux

  From 3.17.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.141; From 6.7.0 · fixed in 6.12.91; From 6.13.0 · fixed in 6.18.33; From 6.19.0 · fixed in 7.0.10

References 8