linux-cve-announce - CVE-2023-53732: fs/ntfs3: Fix NULL dereference in ni_write

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Message-ID: <2025102216-CVE-2023-53732-f3ee@gregkh>
Date: Wed, 22 Oct 2025 15:25:11 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53732: fs/ntfs3: Fix NULL dereference in ni_write_inode

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

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

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

fs/ntfs3: Fix NULL dereference in ni_write_inode

Syzbot reports a NULL dereference in ni_write_inode.
When creating a new inode, if allocation fails in mi_init function
(called in mi_format_new function), mi->mrec is set to NULL.
In the error path of this inode creation, mi->mrec is later
dereferenced in ni_write_inode.

Add a NULL check to prevent NULL dereference.

The Linux kernel CVE team has assigned CVE-2023-53732 to this issue.


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

	Fixed in 5.15.113 with commit d4b74482529516477cf7b12502538e51827c699f
	Fixed in 6.1.81 with commit b3152afc0eb864f7c6ecad134a15b577ef7aec77
	Fixed in 6.3.4 with commit b1135fbaf8ebef93df326761ac70ebcc3c2e3d63
	Fixed in 6.4 with commit 8dae4f6341e335a09575be60b4fdf697c732a470

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-2023-53732
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/ntfs3/frecord.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/d4b74482529516477cf7b12502538e51827c699f
	https://git.kernel.org/stable/c/b3152afc0eb864f7c6ecad134a15b577ef7aec77
	https://git.kernel.org/stable/c/b1135fbaf8ebef93df326761ac70ebcc3c2e3d63
	https://git.kernel.org/stable/c/8dae4f6341e335a09575be60b4fdf697c732a470