linux-cve-announce - CVE-2023-4130: ksmbd: fix wrong next length validation of ea buffer in smb2_set

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Message-ID: <2025081602-CVE-2023-4130-a1c9@gregkh>
Date: Sat, 16 Aug 2025 15:28:04 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-4130: ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()

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

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

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

ksmbd: fix wrong next length validation of ea buffer in smb2_set_ea()

There are multiple smb2_ea_info buffers in FILE_FULL_EA_INFORMATION request
from client. ksmbd find next smb2_ea_info using ->NextEntryOffset of
current smb2_ea_info. ksmbd need to validate buffer length Before
accessing the next ea. ksmbd should check buffer length using buf_len,
not next variable. next is the start offset of current ea that got from
previous ea.

The Linux kernel CVE team has assigned CVE-2023-4130 to this issue.


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

	Fixed in 5.15.127 with commit aeb974907642be095e38ecb1a400ca583958b2b0
	Fixed in 6.1.46 with commit f339d76a3a972601d0738b881b099d49ebbdc3a2
	Fixed in 6.4.11 with commit 4bf629262f9118ee91b1c3a518ebf2b3bcb22180
	Fixed in 6.5 with commit 79ed288cef201f1f212dfb934bcaac75572fb8f6

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-2023-4130
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/aeb974907642be095e38ecb1a400ca583958b2b0
	https://git.kernel.org/stable/c/f339d76a3a972601d0738b881b099d49ebbdc3a2
	https://git.kernel.org/stable/c/4bf629262f9118ee91b1c3a518ebf2b3bcb22180
	https://git.kernel.org/stable/c/79ed288cef201f1f212dfb934bcaac75572fb8f6