linux-cve-announce - CVE-2023-52939: mm: memcg: fix NULL pointer in mem_cgroup_track_foreign_dirty

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Message-ID: <2025032722-CVE-2023-52939-8bb1@gregkh>
Date: Thu, 27 Mar 2025 17:37:29 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52939: mm: memcg: fix NULL pointer in mem_cgroup_track_foreign_dirty_slowpath()

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

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

mm: memcg: fix NULL pointer in mem_cgroup_track_foreign_dirty_slowpath()

As commit 18365225f044 ("hwpoison, memcg: forcibly uncharge LRU pages"),
hwpoison will forcibly uncharg a LRU hwpoisoned page, the folio_memcg
could be NULl, then, mem_cgroup_track_foreign_dirty_slowpath() could
occurs a NULL pointer dereference, let's do not record the foreign
writebacks for folio memcg is null in mem_cgroup_track_foreign_dirty() to
fix it.

The Linux kernel CVE team has assigned CVE-2023-52939 to this issue.


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

	Issue introduced in 5.4 with commit 97b27821b4854ca744946dae32a3f2fd55bcd5bc and fixed in 6.1.11 with commit b79ba5953f6fdc5559389ad415620bffc24f024b
	Issue introduced in 5.4 with commit 97b27821b4854ca744946dae32a3f2fd55bcd5bc and fixed in 6.2 with commit ac86f547ca1002aec2ef66b9e64d03f45bbbfbb9

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-2023-52939
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/memcontrol.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/b79ba5953f6fdc5559389ad415620bffc24f024b
	https://git.kernel.org/stable/c/ac86f547ca1002aec2ef66b9e64d03f45bbbfbb9