linux-cve-announce - CVE-2023-52940: mm: multi-gen LRU: fix crash during cgroup migration

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Message-ID: <2025032722-CVE-2023-52940-2e53@gregkh>
Date: Thu, 27 Mar 2025 17:37:30 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52940: mm: multi-gen LRU: fix crash during cgroup migration

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

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

mm: multi-gen LRU: fix crash during cgroup migration

lru_gen_migrate_mm() assumes lru_gen_add_mm() runs prior to itself.  This
isn't true for the following scenario:

    CPU 1                         CPU 2

  clone()
    cgroup_can_fork()
                                cgroup_procs_write()
    cgroup_post_fork()
                                  task_lock()
                                  lru_gen_migrate_mm()
                                  task_unlock()
    task_lock()
    lru_gen_add_mm()
    task_unlock()

And when the above happens, kernel crashes because of linked list
corruption (mm_struct->lru_gen.list).

The Linux kernel CVE team has assigned CVE-2023-52940 to this issue.


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

	Issue introduced in 6.1 with commit bd74fdaea146029e4fa12c6de89adbe0779348a9 and fixed in 6.1.11 with commit 04448022311cebd30969d3aebdde765f1258b360
	Issue introduced in 6.1 with commit bd74fdaea146029e4fa12c6de89adbe0779348a9 and fixed in 6.2 with commit de08eaa6156405f2e9369f06ba5afae0e4ab3b62

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-2023-52940
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/vmscan.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/04448022311cebd30969d3aebdde765f1258b360
	https://git.kernel.org/stable/c/de08eaa6156405f2e9369f06ba5afae0e4ab3b62