linux-cve-announce - CVE-2022-50856: cifs: Fix xid leak in cifs_ses_add

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Message-ID: <2025123046-CVE-2022-50856-af64@gregkh>
Date: Tue, 30 Dec 2025 13:19:52 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50856: cifs: Fix xid leak in cifs_ses_add_channel()

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

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

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

cifs: Fix xid leak in cifs_ses_add_channel()

Before return, should free the xid, otherwise, the
xid will be leaked.

The Linux kernel CVE team has assigned CVE-2022-50856 to this issue.


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

	Issue introduced in 5.5 with commit d70e9fa55884760b6d6c293dbf20d8c52ce11fb7 and fixed in 5.10.152 with commit 7286f875510486fdc2fc426b7c826262e2283a65
	Issue introduced in 5.5 with commit d70e9fa55884760b6d6c293dbf20d8c52ce11fb7 and fixed in 5.15.76 with commit 847301f0ee1c29f34cc48547ce1071990f24969c
	Issue introduced in 5.5 with commit d70e9fa55884760b6d6c293dbf20d8c52ce11fb7 and fixed in 6.0.6 with commit db2a8b6c17e128d91f35d836c569f4a6bda4471b
	Issue introduced in 5.5 with commit d70e9fa55884760b6d6c293dbf20d8c52ce11fb7 and fixed in 6.1 with commit e909d054bdea75ef1ec48c18c5936affdaecbb2c

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-2022-50856
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/cifs/sess.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/7286f875510486fdc2fc426b7c826262e2283a65
	https://git.kernel.org/stable/c/847301f0ee1c29f34cc48547ce1071990f24969c
	https://git.kernel.org/stable/c/db2a8b6c17e128d91f35d836c569f4a6bda4471b
	https://git.kernel.org/stable/c/e909d054bdea75ef1ec48c18c5936affdaecbb2c