linux-cve-announce - CVE-2022-50484: ALSA: usb-audio: Fix potential memory leaks

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Message-ID: <2025100440-CVE-2022-50484-1a6a@gregkh>
Date: Sat,  4 Oct 2025 17:16:43 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50484: ALSA: usb-audio: Fix potential memory leaks

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

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

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

ALSA: usb-audio: Fix potential memory leaks

When the driver hits -ENOMEM at allocating a URB or a buffer, it
aborts and goes to the error path that releases the all previously
allocated resources.  However, when -ENOMEM hits at the middle of the
sync EP URB allocation loop, the partially allocated URBs might be
left without released, because ep->nurbs is still zero at that point.

Fix it by setting ep->nurbs at first, so that the error handler loops
over the full URB list.

The Linux kernel CVE team has assigned CVE-2022-50484 to this issue.


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

	Fixed in 4.9.331 with commit 0604e5e5537af099ea2f6dfd892afe5c92db8a80
	Fixed in 4.14.296 with commit 28d8d267af5d73f91d7640cbdb4024703256e36c
	Fixed in 4.19.262 with commit 46f0aed47673e275d682af60ed26dcc28add8eae
	Fixed in 5.4.220 with commit 988ec0cd0a2643c25c1658f7c33de2e15a5a2e31
	Fixed in 5.10.150 with commit bc1d16d282bca421c6fc31de4b8fd412010f01bd
	Fixed in 5.15.75 with commit 0672215994e2347a9b4f145e2bc1709b1e01cee3
	Fixed in 5.19.17 with commit faa8c1ed77d0169955b9b3516b714cc5fb512f27
	Fixed in 6.0.3 with commit e4442410f76d66b9f7e854010bce04853f665324
	Fixed in 6.1 with commit 6382da0828995af87aa8b8bef28cc61aceb4aff3

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-2022-50484
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/endpoint.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/0604e5e5537af099ea2f6dfd892afe5c92db8a80
	https://git.kernel.org/stable/c/28d8d267af5d73f91d7640cbdb4024703256e36c
	https://git.kernel.org/stable/c/46f0aed47673e275d682af60ed26dcc28add8eae
	https://git.kernel.org/stable/c/988ec0cd0a2643c25c1658f7c33de2e15a5a2e31
	https://git.kernel.org/stable/c/bc1d16d282bca421c6fc31de4b8fd412010f01bd
	https://git.kernel.org/stable/c/0672215994e2347a9b4f145e2bc1709b1e01cee3
	https://git.kernel.org/stable/c/faa8c1ed77d0169955b9b3516b714cc5fb512f27
	https://git.kernel.org/stable/c/e4442410f76d66b9f7e854010bce04853f665324
	https://git.kernel.org/stable/c/6382da0828995af87aa8b8bef28cc61aceb4aff3