linux-cve-announce - CVE-2022-50869: fs/ntfs3: Fix slab-out-of-bounds in r

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Message-ID: <2025123050-CVE-2022-50869-8a8f@gregkh>
Date: Tue, 30 Dec 2025 13:20:05 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50869: fs/ntfs3: Fix slab-out-of-bounds in r_page

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

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

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

fs/ntfs3: Fix slab-out-of-bounds in r_page

When PAGE_SIZE is 64K, if read_log_page is called by log_read_rst for
the first time, the size of *buffer would be equal to
DefaultLogPageSize(4K).But for *buffer operations like memcpy,
if the memory area size(n) which being assigned to buffer is larger
than 4K (log->page_size(64K) or bytes(64K-page_off)), it will cause
an out of boundary error.
 Call trace:
  [...]
  kasan_report+0x44/0x130
  check_memory_region+0xf8/0x1a0
  memcpy+0xc8/0x100
  ntfs_read_run_nb+0x20c/0x460
  read_log_page+0xd0/0x1f4
  log_read_rst+0x110/0x75c
  log_replay+0x1e8/0x4aa0
  ntfs_loadlog_and_replay+0x290/0x2d0
  ntfs_fill_super+0x508/0xec0
  get_tree_bdev+0x1fc/0x34c
  [...]

Fix this by setting variable r_page to NULL in log_read_rst.

The Linux kernel CVE team has assigned CVE-2022-50869 to this issue.

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

	Fixed in 5.15.87 with commit ed686e7a26dd19ae6b46bb662f735acfa88ff7bc
	Fixed in 6.0.17 with commit bf86a640a34947d92062996e1a75b9cd9d83dd19
	Fixed in 6.1.3 with commit 6d076293e5bffdf897ea5f975669206e09beed6a
	Fixed in 6.2 with commit ecfbd57cf9c5ca225184ae266ce44ae473792132

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-2022-50869
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/fslog.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/ed686e7a26dd19ae6b46bb662f735acfa88ff7bc
	https://git.kernel.org/stable/c/bf86a640a34947d92062996e1a75b9cd9d83dd19
	https://git.kernel.org/stable/c/6d076293e5bffdf897ea5f975669206e09beed6a
	https://git.kernel.org/stable/c/ecfbd57cf9c5ca225184ae266ce44ae473792132