linux-cve-announce - CVE-2026-23142: mm/damon/sysfs-scheme: cleanup access_pattern subdirs on scheme dir setup failure

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Message-ID: <2026021416-CVE-2026-23142-f91e@gregkh>
Date: Sat, 14 Feb 2026 16:36:16 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23142: mm/damon/sysfs-scheme: cleanup access_pattern subdirs on scheme dir setup failure

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

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

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

mm/damon/sysfs-scheme: cleanup access_pattern subdirs on scheme dir setup failure

When a DAMOS-scheme DAMON sysfs directory setup fails after setup of
access_pattern/ directory, subdirectories of access_pattern/ directory are
not cleaned up.  As a result, DAMON sysfs interface is nearly broken until
the system reboots, and the memory for the unremoved directory is leaked.

Cleanup the directories under such failures.

The Linux kernel CVE team has assigned CVE-2026-23142 to this issue.


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

	Issue introduced in 5.18 with commit 9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990 and fixed in 6.1.162 with commit ae8ac0066b48ed957bdcab58f0d3543549c57a29
	Issue introduced in 5.18 with commit 9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990 and fixed in 6.6.122 with commit e9711bd0e64812c694a228cf58c9e6032decee54
	Issue introduced in 5.18 with commit 9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990 and fixed in 6.12.67 with commit 16236b0b4a08fa3e326cf1373ef789dabdc2e30d
	Issue introduced in 5.18 with commit 9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990 and fixed in 6.18.7 with commit 725d4fdaa01bd1161782081f419e1568cc7432e0
	Issue introduced in 5.18 with commit 9bbb820a5bd5f406ae5e0819cc31f2c2e6f4d990 and fixed in 6.19 with commit 392b3d9d595f34877dd745b470c711e8ebcd225c

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-2026-23142
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/damon/sysfs-schemes.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/ae8ac0066b48ed957bdcab58f0d3543549c57a29
	https://git.kernel.org/stable/c/e9711bd0e64812c694a228cf58c9e6032decee54
	https://git.kernel.org/stable/c/16236b0b4a08fa3e326cf1373ef789dabdc2e30d
	https://git.kernel.org/stable/c/725d4fdaa01bd1161782081f419e1568cc7432e0
	https://git.kernel.org/stable/c/392b3d9d595f34877dd745b470c711e8ebcd225c