linux-cve-announce - CVE-2023-53830: platform/x86: think-lmi: Fix memory leak when showing current settings

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Message-ID: <2025120953-CVE-2023-53830-7785@gregkh>
Date: Tue,  9 Dec 2025 10:31:14 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53830: platform/x86: think-lmi: Fix memory leak when showing current settings

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

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

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

platform/x86: think-lmi: Fix memory leak when showing current settings

When retriving a item string with tlmi_setting(), the result has to be
freed using kfree(). In current_value_show() however, malformed
item strings are not freed, causing a memory leak.
Fix this by eliminating the early return responsible for this.

The Linux kernel CVE team has assigned CVE-2023-53830 to this issue.


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

	Issue introduced in 5.14 with commit 0fdf10e5fc964c315cf131a2eaab9cc531a9f40f and fixed in 5.15.107 with commit b9396d991abe8d1ac31a043274ab20b49f92c2e6
	Issue introduced in 5.14 with commit 0fdf10e5fc964c315cf131a2eaab9cc531a9f40f and fixed in 6.1.24 with commit 9071525bfcb1f5674117dbed3eca0cd7b122813b
	Issue introduced in 5.14 with commit 0fdf10e5fc964c315cf131a2eaab9cc531a9f40f and fixed in 6.2.11 with commit 5f99014c19fa50a5719c0bb78143282632675893
	Issue introduced in 5.14 with commit 0fdf10e5fc964c315cf131a2eaab9cc531a9f40f and fixed in 6.3 with commit a3c4c053014585dcf20f4df954791b74d8a8afcd

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-2023-53830
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:
	drivers/platform/x86/think-lmi.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/b9396d991abe8d1ac31a043274ab20b49f92c2e6
	https://git.kernel.org/stable/c/9071525bfcb1f5674117dbed3eca0cd7b122813b
	https://git.kernel.org/stable/c/5f99014c19fa50a5719c0bb78143282632675893
	https://git.kernel.org/stable/c/a3c4c053014585dcf20f4df954791b74d8a8afcd