linux-cve-announce - CVE-2022-50147: mm/mempolicy: fix get

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Message-ID: <2025061820-CVE-2022-50147-40b3@gregkh>
Date: Wed, 18 Jun 2025 13:03:32 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50147: mm/mempolicy: fix get_nodes out of bound access

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

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

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

mm/mempolicy: fix get_nodes out of bound access

When user specified more nodes than supported, get_nodes will access nmask
array out of bounds.

The Linux kernel CVE team has assigned CVE-2022-50147 to this issue.


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

	Issue introduced in 5.15 with commit e130242dc351f1cfa2bbeb6766a1486ce936ef88 and fixed in 5.15.61 with commit 44652154484e7e3d12008802cfb6c28a8aa16d85
	Issue introduced in 5.15 with commit e130242dc351f1cfa2bbeb6766a1486ce936ef88 and fixed in 5.18.18 with commit 8176f6a0d9c1b06bc7af7c3d6acd4a66448939df
	Issue introduced in 5.15 with commit e130242dc351f1cfa2bbeb6766a1486ce936ef88 and fixed in 5.19.2 with commit d1b5113674c3e95bb53c601ce2ea4719e851c74d
	Issue introduced in 5.15 with commit e130242dc351f1cfa2bbeb6766a1486ce936ef88 and fixed in 6.0 with commit 000eca5d044d1ee23b4ca311793cf3fc528da6c6

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-2022-50147
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:
	mm/mempolicy.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/44652154484e7e3d12008802cfb6c28a8aa16d85
	https://git.kernel.org/stable/c/8176f6a0d9c1b06bc7af7c3d6acd4a66448939df
	https://git.kernel.org/stable/c/d1b5113674c3e95bb53c601ce2ea4719e851c74d
	https://git.kernel.org/stable/c/000eca5d044d1ee23b4ca311793cf3fc528da6c6