linux-cve-announce - CVE-2022-49946: clk: bcm: rpi: Prevent out-of-bounds access

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Message-ID: <2025061808-CVE-2022-49946-6601@gregkh>
Date: Wed, 18 Jun 2025 13:00:11 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49946: clk: bcm: rpi: Prevent out-of-bounds access

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

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

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

clk: bcm: rpi: Prevent out-of-bounds access

The while loop in raspberrypi_discover_clocks() relies on the assumption
that the id of the last clock element is zero. Because this data comes
from the Videocore firmware and it doesn't guarantuee such a behavior
this could lead to out-of-bounds access. So fix this by providing
a sentinel element.

The Linux kernel CVE team has assigned CVE-2022-49946 to this issue.


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

	Issue introduced in 5.9 with commit 93d2725affd65686792f4b57e49ef660f3c8c0f9 and fixed in 5.10.142 with commit fcae47b2d23c81603b01f56cf8db63ed64599d34
	Issue introduced in 5.9 with commit 93d2725affd65686792f4b57e49ef660f3c8c0f9 and fixed in 5.15.66 with commit ff0b144d4b0a9fbd6efe4d2c0a4b6c9bae2138d2
	Issue introduced in 5.9 with commit 93d2725affd65686792f4b57e49ef660f3c8c0f9 and fixed in 5.19.8 with commit c8b04b731d43366824841ebdca4ac715f95e0ea4
	Issue introduced in 5.9 with commit 93d2725affd65686792f4b57e49ef660f3c8c0f9 and fixed in 6.0 with commit bc163555603e4ae9c817675ad80d618a4cdbfa2d

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-2022-49946
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/clk/bcm/clk-raspberrypi.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/fcae47b2d23c81603b01f56cf8db63ed64599d34
	https://git.kernel.org/stable/c/ff0b144d4b0a9fbd6efe4d2c0a4b6c9bae2138d2
	https://git.kernel.org/stable/c/c8b04b731d43366824841ebdca4ac715f95e0ea4
	https://git.kernel.org/stable/c/bc163555603e4ae9c817675ad80d618a4cdbfa2d