linux-cve-announce - CVE-2023-52756: pwm: Fix double shift bug

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Message-ID: <2024052146-CVE-2023-52756-f694@gregkh>
Date: Tue, 21 May 2024 17:30:52 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52756: pwm: Fix double shift bug

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

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

pwm: Fix double shift bug

These enums are passed to set/test_bit().  The set/test_bit() functions
take a bit number instead of a shifted value.  Passing a shifted value
is a double shift bug like doing BIT(BIT(1)).  The double shift bug
doesn't cause a problem here because we are only checking 0 and 1 but
if the value was 5 or above then it can lead to a buffer overflow.

The Linux kernel CVE team has assigned CVE-2023-52756 to this issue.


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

	Fixed in 4.14.331 with commit bce1f7c7e981
	Fixed in 4.19.300 with commit a98ff250b5af
	Fixed in 5.4.262 with commit eca19db60f99
	Fixed in 5.10.202 with commit e52518b9cb9f
	Fixed in 5.15.140 with commit a7ee519e8095
	Fixed in 6.1.64 with commit 1fb3a9c59e7f
	Fixed in 6.5.13 with commit c19a8794bf4f
	Fixed in 6.6.3 with commit 45d0a298e05a
	Fixed in 6.7 with commit d27abbfd4888

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-2023-52756
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:
	include/linux/pwm.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/bce1f7c7e9812da57de1dda293cba87c693e9958
	https://git.kernel.org/stable/c/a98ff250b5af87f92f17bb9725cb21de1931ee57
	https://git.kernel.org/stable/c/eca19db60f99925461f49c3fd743733881395728
	https://git.kernel.org/stable/c/e52518b9cb9fc98fc043c8fb2b8cfc619ca8a88b
	https://git.kernel.org/stable/c/a7ee519e8095d9c834086d0ff40da11415e1e4d7
	https://git.kernel.org/stable/c/1fb3a9c59e7f7d2b1d737a0d6e02e31d5b516455
	https://git.kernel.org/stable/c/c19a8794bf4fe45cff997f07a75ea84cc9e5d89c
	https://git.kernel.org/stable/c/45d0a298e05adee521f6fe605d6a88341ba07edd
	https://git.kernel.org/stable/c/d27abbfd4888d79dd24baf50e774631046ac4732