Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-24T00:00:00 kernel: Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-364

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.

A flaw was found in the Linux kernel's Bluetooth subsystem. Improper handling of locking within the `hci_conn_request_evt()` function, particularly when the `HCI_PROTO_DEFER` protocol is active, can result in a Use-After-Free (UAF) vulnerability. This condition arises when a connection object is accessed after it has been deallocated, potentially allowing a local attacker to cause a system crash or execute arbitrary code.

Red Hat Enterprise Linux 10 Affected kernel Red Hat Enterprise Linux 6 Out of support scope kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Affected kernel Red Hat Enterprise Linux 8 Affected kernel-rt Red Hat Enterprise Linux 9 Affected kernel Red Hat Enterprise Linux 9 Affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53072 https://nvd.nist.gov/vuln/detail/CVE-2026-53072 https://lore.kernel.org/linux-cve-announce/2026062405-CVE-2026-53072-8c50@gregkh/T