linux-cve-announce - CVE-2023-53377: cifs: prevent use-after-free by freeing the cfile later

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Message-ID: <2025091856-CVE-2023-53377-baaf@gregkh>
Date: Thu, 18 Sep 2025 15:34:22 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53377: cifs: prevent use-after-free by freeing the cfile later

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

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

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

cifs: prevent use-after-free by freeing the cfile later

In smb2_compound_op we have a possible use-after-free
which can cause hard to debug problems later on.

This was revealed during stress testing with KASAN enabled
kernel. Fixing it by moving the cfile free call to
a few lines below, after the usage.

The Linux kernel CVE team has assigned CVE-2023-53377 to this issue.


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

	Issue introduced in 6.1 with commit 76894f3e2f71177747b8b4763fb180e800279585 and fixed in 6.1.39 with commit 4fe07d55a5461e66a55fbefb57f85ff0facea32b
	Issue introduced in 6.1 with commit 76894f3e2f71177747b8b4763fb180e800279585 and fixed in 6.3.13 with commit b6353518ef8180816e863aa23b06456f395404d6
	Issue introduced in 6.1 with commit 76894f3e2f71177747b8b4763fb180e800279585 and fixed in 6.4.4 with commit d017880782cf71f8820ee4a2002843893176501d
	Issue introduced in 6.1 with commit 76894f3e2f71177747b8b4763fb180e800279585 and fixed in 6.5 with commit 33f736187d08f6bc822117629f263b97d3df4165
	Issue introduced in 6.0.16 with commit 2d046892a493d9760c35fdaefc3017f27f91b621

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-2023-53377
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:
	fs/smb/client/smb2inode.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/4fe07d55a5461e66a55fbefb57f85ff0facea32b
	https://git.kernel.org/stable/c/b6353518ef8180816e863aa23b06456f395404d6
	https://git.kernel.org/stable/c/d017880782cf71f8820ee4a2002843893176501d
	https://git.kernel.org/stable/c/33f736187d08f6bc822117629f263b97d3df4165