linux-cve-announce - CVE-2022-49754: Bluetooth: Fix a buffer overflow in mgmt_mesh

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Message-ID: <2025032701-CVE-2022-49754-cc36@gregkh>
Date: Thu, 27 Mar 2025 17:43:12 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49754: Bluetooth: Fix a buffer overflow in mgmt_mesh_add()

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

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

Bluetooth: Fix a buffer overflow in mgmt_mesh_add()

Smatch Warning:
net/bluetooth/mgmt_util.c:375 mgmt_mesh_add() error: __memcpy()
'mesh_tx->param' too small (48 vs 50)

Analysis:

'mesh_tx->param' is array of size 48. This is the destination.
u8 param[sizeof(struct mgmt_cp_mesh_send) + 29]; // 19 + 29 = 48.

But in the caller 'mesh_send' we reject only when len > 50.
len > (MGMT_MESH_SEND_SIZE + 31) // 19 + 31 = 50.

The Linux kernel CVE team has assigned CVE-2022-49754 to this issue.


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

	Issue introduced in 6.1 with commit b338d91703fae6f6afd67f3f75caa3b8f36ddef3 and fixed in 6.1.9 with commit ed818fd8c531abf561b379995ee7cc4c68029464
	Issue introduced in 6.1 with commit b338d91703fae6f6afd67f3f75caa3b8f36ddef3 and fixed in 6.2 with commit 2185e0fdbb2137f22a9dd9fcbf6481400d56299b

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-2022-49754
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/mgmt_util.h


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/ed818fd8c531abf561b379995ee7cc4c68029464
	https://git.kernel.org/stable/c/2185e0fdbb2137f22a9dd9fcbf6481400d56299b