Bug 2492408 (CVE-2026-53072)

Summary: CVE-2026-53072 kernel: Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
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.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-06-24 18:10:41 UTC 
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.
Comment 1 Keith Grant 2026-06-25 20:22:58 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062405-CVE-2026-53072-8c50@gregkh/T
Comment 3 errata-xmlrpc 2026-09-08 11:35:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:65334 https://access.redhat.com/errata/RHSA-2026:65334
Comment 4 Jon Orris 2026-09-14 13:35:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:67150 https://access.redhat.com/errata/RHSA-2026:67150