linux-cve-announce - CVE-2023-32249: ksmbd: not allow guest user on multichannel

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Message-ID: <2025081653-CVE-2023-32249-7aca@gregkh>
Date: Sat, 16 Aug 2025 15:25:54 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-32249: ksmbd: not allow guest user on multichannel

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

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

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

ksmbd: not allow guest user on multichannel

This patch return STATUS_NOT_SUPPORTED if binding session is guest.

The Linux kernel CVE team has assigned CVE-2023-32249 to this issue.


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

	Fixed in 5.15.112 with commit ed76d3a8910be06cd4e4ba63bf6075bf903945a1
	Fixed in 6.1.28 with commit 1f0490586544455e5be698be2e6c30077b4ec461
	Fixed in 6.2.15 with commit 4a98e859c4673013385a54084e0cd865695ca072
	Fixed in 6.3.2 with commit 088131b7b01099720a528a72005ff17868705d40
	Fixed in 6.4 with commit 3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2

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-2023-32249
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/ed76d3a8910be06cd4e4ba63bf6075bf903945a1
	https://git.kernel.org/stable/c/1f0490586544455e5be698be2e6c30077b4ec461
	https://git.kernel.org/stable/c/4a98e859c4673013385a54084e0cd865695ca072
	https://git.kernel.org/stable/c/088131b7b01099720a528a72005ff17868705d40
	https://git.kernel.org/stable/c/3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2