linux-cve-announce - CVE-2023-53479: cxl/acpi: Fix a use-after-free in cxl_parse

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Message-ID: <2025100112-CVE-2023-53479-5c70@gregkh>
Date: Wed,  1 Oct 2025 13:42:49 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53479: cxl/acpi: Fix a use-after-free in cxl_parse_cfmws()

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

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

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

cxl/acpi: Fix a use-after-free in cxl_parse_cfmws()

KASAN and KFENCE detected an user-after-free in the CXL driver. This
happens in the cxl_decoder_add() fail path. KASAN prints the following
error:

   BUG: KASAN: slab-use-after-free in cxl_parse_cfmws (drivers/cxl/acpi.c:299)

This happens in cxl_parse_cfmws(), where put_device() is called,
releasing cxld, which is accessed later.

Use the local variables in the dev_err() instead of pointing to the
released memory. Since the dev_err() is printing a resource, change the open
coded print format to use the %pr format specifier.

The Linux kernel CVE team has assigned CVE-2023-53479 to this issue.


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

	Issue introduced in 6.0 with commit e50fe01e1f2a4aba2275edee7d5c77ac87674ddb and fixed in 6.1.43 with commit 748fadc08bcbdaf573b34d9784bb3dbd87441dbf
	Issue introduced in 6.0 with commit e50fe01e1f2a4aba2275edee7d5c77ac87674ddb and fixed in 6.4.8 with commit 316db489647b8ddc381682597e89787eac61a278
	Issue introduced in 6.0 with commit e50fe01e1f2a4aba2275edee7d5c77ac87674ddb and fixed in 6.5 with commit 4cf67d3cc9994a59cf77bb9c0ccf9007fe916afe

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-2023-53479
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/cxl/acpi.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/748fadc08bcbdaf573b34d9784bb3dbd87441dbf
	https://git.kernel.org/stable/c/316db489647b8ddc381682597e89787eac61a278
	https://git.kernel.org/stable/c/4cf67d3cc9994a59cf77bb9c0ccf9007fe916afe