linux-cve-announce - CVE-2023-53828: Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv

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Message-ID: <2025120952-CVE-2023-53828-57cf@gregkh>
Date: Tue,  9 Dec 2025 10:31:12 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53828: Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv_monitor()

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

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

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

Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv_monitor()

KSAN reports use-after-free in hci_add_adv_monitor().

While adding an adv monitor,
    hci_add_adv_monitor() calls ->
    msft_add_monitor_pattern() calls ->
    msft_add_monitor_sync() calls ->
    msft_le_monitor_advertisement_cb() calls in an error case ->
    hci_free_adv_monitor() which frees the *moniter.

This is referenced by bt_dev_dbg() in hci_add_adv_monitor().

Fix the bt_dev_dbg() by using handle instead of monitor->handle.

The Linux kernel CVE team has assigned CVE-2023-53828 to this issue.


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

	Issue introduced in 6.0 with commit b747a83690c8f53bc7a3f75899415c699b2c51aa and fixed in 6.1.53 with commit 81d8e9f59df63b8358751c1ffed9f1cf5c796909
	Issue introduced in 6.0 with commit b747a83690c8f53bc7a3f75899415c699b2c51aa and fixed in 6.4.16 with commit aafda69d4807f5edf3558c9534be9b911774e63a
	Issue introduced in 6.0 with commit b747a83690c8f53bc7a3f75899415c699b2c51aa and fixed in 6.5.3 with commit 8d66f7ced51cb924bc90278d6a0a26a52877271a
	Issue introduced in 6.0 with commit b747a83690c8f53bc7a3f75899415c699b2c51aa and fixed in 6.6 with commit a2bcd2b63271a93a695fabbfbf459c603d956d48

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-2023-53828
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_core.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/81d8e9f59df63b8358751c1ffed9f1cf5c796909
	https://git.kernel.org/stable/c/aafda69d4807f5edf3558c9534be9b911774e63a
	https://git.kernel.org/stable/c/8d66f7ced51cb924bc90278d6a0a26a52877271a
	https://git.kernel.org/stable/c/a2bcd2b63271a93a695fabbfbf459c603d956d48