linux-cve-announce - CVE-2023-3867: ksmbd: fix out of bounds read in smb2_sess

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Message-ID: <2025081654-CVE-2023-3867-d236@gregkh>
Date: Sat, 16 Aug 2025 15:29:55 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-3867: ksmbd: fix out of bounds read in smb2_sess_setup

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

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

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

ksmbd: fix out of bounds read in smb2_sess_setup

ksmbd does not consider the case of that smb2 session setup is
in compound request. If this is the second payload of the compound,
OOB read issue occurs while processing the first payload in
the smb2_sess_setup().

The Linux kernel CVE team has assigned CVE-2023-3867 to this issue.


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

	Fixed in 5.15.145 with commit 676392184785ace61e939831e7ca44a03d438c3b
	Fixed in 6.1.40 with commit ef572ffa8eb44111eed2925fbb2adca78bdcbf61
	Fixed in 6.4.5 with commit 2ba03cecb12ac7ac9e0170e251543c56832d9959
	Fixed in 6.5 with commit 98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8

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-2023-3867
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/server/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/676392184785ace61e939831e7ca44a03d438c3b
	https://git.kernel.org/stable/c/ef572ffa8eb44111eed2925fbb2adca78bdcbf61
	https://git.kernel.org/stable/c/2ba03cecb12ac7ac9e0170e251543c56832d9959
	https://git.kernel.org/stable/c/98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8