linux-cve-announce - CVE-2022-49772: ALSA: usb-audio: Drop snd_BUG_ON() from snd_usbmidi_output

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025050116-CVE-2022-49772-912e@gregkh>
Date: Thu,  1 May 2025 16:09:22 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49772: ALSA: usb-audio: Drop snd_BUG_ON() from snd_usbmidi_output_open()

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

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

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

ALSA: usb-audio: Drop snd_BUG_ON() from snd_usbmidi_output_open()

snd_usbmidi_output_open() has a check of the NULL port with
snd_BUG_ON().  snd_BUG_ON() was used as this shouldn't have happened,
but in reality, the NULL port may be seen when the device gives an
invalid endpoint setup at the descriptor, hence the driver skips the
allocation.  That is, the check itself is valid and snd_BUG_ON()
should be dropped from there.  Otherwise it's confusing as if it were
a real bug, as recently syzbot stumbled on it.

The Linux kernel CVE team has assigned CVE-2022-49772 to this issue.


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

	Fixed in 4.9.334 with commit 872c9314769e89d8bda74ff3ac584756a45ee752
	Fixed in 4.14.300 with commit 368a01e5064c13946d032ab1d65ba95020a39cc5
	Fixed in 4.19.267 with commit c43991065f36f7628cd124e037b8750c4617a7a7
	Fixed in 5.4.225 with commit e7dc436aea80308a9268e6d2d85f910ff107de9b
	Fixed in 5.10.156 with commit a80369c8ca50bc885d14386087a834659ec54a54
	Fixed in 5.15.80 with commit 02b94885b2fdf1808b1874e009bfb90753f8f4db
	Fixed in 6.0.10 with commit 00f5f1bbf815a39e9eecb468d12ca55d3360eb10
	Fixed in 6.1 with commit ad72c3c3f6eb81d2cb189ec71e888316adada5df

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-2022-49772
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:
	sound/usb/midi.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/872c9314769e89d8bda74ff3ac584756a45ee752
	https://git.kernel.org/stable/c/368a01e5064c13946d032ab1d65ba95020a39cc5
	https://git.kernel.org/stable/c/c43991065f36f7628cd124e037b8750c4617a7a7
	https://git.kernel.org/stable/c/e7dc436aea80308a9268e6d2d85f910ff107de9b
	https://git.kernel.org/stable/c/a80369c8ca50bc885d14386087a834659ec54a54
	https://git.kernel.org/stable/c/02b94885b2fdf1808b1874e009bfb90753f8f4db
	https://git.kernel.org/stable/c/00f5f1bbf815a39e9eecb468d12ca55d3360eb10
	https://git.kernel.org/stable/c/ad72c3c3f6eb81d2cb189ec71e888316adada5df