linux-cve-announce - CVE-2023-53374: Bluetooth: hci_conn: fail SCO/ISO via hci_conn

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Message-ID: <2025091855-CVE-2023-53374-d003@gregkh>
Date: Thu, 18 Sep 2025 15:34:19 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53374: Bluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

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

Bluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early

Not calling hci_(dis)connect_cfm before deleting conn referred to by a
socket generally results to use-after-free.

When cleaning up SCO connections when the parent ACL is deleted too
early, use hci_conn_failed to do the connection cleanup properly.

We also need to clean up ISO connections in a similar situation when
connecting has started but LE Create CIS is not yet sent, so do it too
here.

The Linux kernel CVE team has assigned CVE-2023-53374 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.4 with commit ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f and fixed in 6.4.16 with commit 397d58007532644b35fad746da48c41161f32a57
	Issue introduced in 6.4 with commit ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f and fixed in 6.5.3 with commit e94b898463a62b72a2a8b75dea8936bf4db78e00
	Issue introduced in 6.4 with commit ca1fd42e7dbfcb34890ffbf1f2f4b356776dab6f and fixed in 6.6 with commit 3344d318337d9dca928fd448e966557ec5063f85
	Issue introduced in 6.3.8 with commit 75e35bd4b7935ceed2aacd82f55940e73bf0b63b

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2023-53374
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/bluetooth/hci_conn.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/397d58007532644b35fad746da48c41161f32a57
	https://git.kernel.org/stable/c/e94b898463a62b72a2a8b75dea8936bf4db78e00
	https://git.kernel.org/stable/c/3344d318337d9dca928fd448e966557ec5063f85