linux-cve-announce - CVE-2023-53061: ksmbd: fix possible refcount leak in smb2

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Message-ID: <2025050210-CVE-2023-53061-49b8@gregkh>
Date: Fri,  2 May 2025 17:55:26 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53061: ksmbd: fix possible refcount leak in smb2_open()

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

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

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

ksmbd: fix possible refcount leak in smb2_open()

Reference count of acls will leak when memory allocation fails. Fix this
by adding the missing posix_acl_release().

The Linux kernel CVE team has assigned CVE-2023-53061 to this issue.


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

	Issue introduced in 5.15 with commit e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and fixed in 5.15.105 with commit c33344b7972225b232966f95d31f6312dcc6273d
	Issue introduced in 5.15 with commit e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and fixed in 6.1.22 with commit 303f8e58cc3ace744801dcdcabfc06ffc72ed62d
	Issue introduced in 5.15 with commit e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and fixed in 6.2.9 with commit a22c49a05e5e7aa2c414fbc42c49c4c01a5c9a78
	Issue introduced in 5.15 with commit e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and fixed in 6.3 with commit 2624b445544ffc1472ccabfb6ec867c199d4c95c

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-2023-53061
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/ksmbd/smb2pdu.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/c33344b7972225b232966f95d31f6312dcc6273d
	https://git.kernel.org/stable/c/303f8e58cc3ace744801dcdcabfc06ffc72ed62d
	https://git.kernel.org/stable/c/a22c49a05e5e7aa2c414fbc42c49c4c01a5c9a78
	https://git.kernel.org/stable/c/2624b445544ffc1472ccabfb6ec867c199d4c95c