linux-cve-announce - CVE-2022-50131: HID: mcp2221: prevent a buffer overflow in mcp_smbus

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Message-ID: <2025061815-CVE-2022-50131-4df3@gregkh>
Date: Wed, 18 Jun 2025 13:03:16 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50131: HID: mcp2221: prevent a buffer overflow in mcp_smbus_write()

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

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

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

HID: mcp2221: prevent a buffer overflow in mcp_smbus_write()

Smatch Warning:
drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy()
'&mcp->txbuf[5]' too small (59 vs 255)
drivers/hid/hid-mcp2221.c:388 mcp_smbus_write() error: __memcpy() 'buf'
too small (34 vs 255)

The 'len' variable can take a value between 0-255 as it can come from
data->block[0] and it is user data. So add an bound check to prevent a
buffer overflow in memcpy().

The Linux kernel CVE team has assigned CVE-2022-50131 to this issue.


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

	Issue introduced in 5.7 with commit 67a95c21463d066060b0f66d65a75d45bb386ffb and fixed in 5.10.137 with commit 66c8e816f2f2ca4a61b406503bd10bad1b35f72f
	Issue introduced in 5.7 with commit 67a95c21463d066060b0f66d65a75d45bb386ffb and fixed in 5.15.61 with commit 91443c669d280937968f0aa4edefa741cfe35314
	Issue introduced in 5.7 with commit 67a95c21463d066060b0f66d65a75d45bb386ffb and fixed in 5.18.18 with commit 6402116a7b5ec80fa40fd145a80c813019cd555f
	Issue introduced in 5.7 with commit 67a95c21463d066060b0f66d65a75d45bb386ffb and fixed in 5.19.2 with commit 3c0f8a59f2cc8841ee6653399a77f4f3e6e9a270
	Issue introduced in 5.7 with commit 67a95c21463d066060b0f66d65a75d45bb386ffb and fixed in 6.0 with commit 62ac2473553a00229e67bdf3cb023b62cf7f5a9a

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-2022-50131
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:
	drivers/hid/hid-mcp2221.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/66c8e816f2f2ca4a61b406503bd10bad1b35f72f
	https://git.kernel.org/stable/c/91443c669d280937968f0aa4edefa741cfe35314
	https://git.kernel.org/stable/c/6402116a7b5ec80fa40fd145a80c813019cd555f
	https://git.kernel.org/stable/c/3c0f8a59f2cc8841ee6653399a77f4f3e6e9a270
	https://git.kernel.org/stable/c/62ac2473553a00229e67bdf3cb023b62cf7f5a9a