linux-cve-announce - CVE-2023-53997: thermal: of: fix double-free on unregistration

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Message-ID: <2025122426-CVE-2023-53997-8776@gregkh>
Date: Wed, 24 Dec 2025 11:56:41 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53997: thermal: of: fix double-free on unregistration

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

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

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

thermal: of: fix double-free on unregistration

Since commit 3d439b1a2ad3 ("thermal/core: Alloc-copy-free the thermal
zone parameters structure"), thermal_zone_device_register() allocates
a copy of the tzp argument and frees it when unregistering, so
thermal_of_zone_register() now ends up leaking its original tzp and
double-freeing the tzp copy. Fix this by locating tzp on stack instead.

The Linux kernel CVE team has assigned CVE-2023-53997 to this issue.


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

	Issue introduced in 6.4 with commit 3d439b1a2ad36c8b4ea151c8de25309d60d17407 and fixed in 6.4.8 with commit adce49089412a9ae28f5c666e0bb12fbcd86b3f7
	Issue introduced in 6.4 with commit 3d439b1a2ad36c8b4ea151c8de25309d60d17407 and fixed in 6.5 with commit ac4436a5b20e0ef1f608a9ef46c08d5d142f8da6

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-2023-53997
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/thermal/thermal_of.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/adce49089412a9ae28f5c666e0bb12fbcd86b3f7
	https://git.kernel.org/stable/c/ac4436a5b20e0ef1f608a9ef46c08d5d142f8da6