linux-cve-announce - CVE-2023-54076: smb: client: fix missed ses refcounting

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Message-ID: <2025122433-CVE-2023-54076-e317@gregkh>
Date: Wed, 24 Dec 2025 13:27:09 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54076: smb: client: fix missed ses refcounting

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

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

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

smb: client: fix missed ses refcounting

Use new cifs_smb_ses_inc_refcount() helper to get an active reference
of @ses and @ses->dfs_root_ses (if set).  This will prevent
@ses->dfs_root_ses of being put in the next call to cifs_put_smb_ses()
and thus potentially causing an use-after-free bug.

The Linux kernel CVE team has assigned CVE-2023-54076 to this issue.


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

	Issue introduced in 6.4 with commit 8e3554150d6c80a84b3cb046615d1a0e943811dc and fixed in 6.4.7 with commit eb382196e6f6e05cfafdab797840e5a96c6e7bf0
	Issue introduced in 6.4 with commit 8e3554150d6c80a84b3cb046615d1a0e943811dc and fixed in 6.5 with commit bf99f6be2d20146942bce6f9e90a0ceef12cbc1e
	Issue introduced in 6.2.15 with commit f30d226bcc9f0e2d97b4a6e94c43a28148fbeab6
	Issue introduced in 6.3.2 with commit c082c3be0f96e759ff2e361d929832fda0b93851

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-2023-54076
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/dfs.c
	fs/smb/client/smb2transport.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/eb382196e6f6e05cfafdab797840e5a96c6e7bf0
	https://git.kernel.org/stable/c/bf99f6be2d20146942bce6f9e90a0ceef12cbc1e