linux-cve-announce - CVE-2022-50306: ext4: fix potential out of bound read in ext4_fc_replay

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Message-ID: <2025091559-CVE-2022-50306-c1da@gregkh>
Date: Mon, 15 Sep 2025 16:46:08 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50306: ext4: fix potential out of bound read in ext4_fc_replay_scan()

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

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

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

ext4: fix potential out of bound read in ext4_fc_replay_scan()

For scan loop must ensure that at least EXT4_FC_TAG_BASE_LEN space. If remain
space less than EXT4_FC_TAG_BASE_LEN which will lead to out of bound read
when mounting corrupt file system image.
ADD_RANGE/HEAD/TAIL is needed to add extra check when do journal scan, as this
three tags will read data during scan, tag length couldn't less than data length
which will read.

The Linux kernel CVE team has assigned CVE-2022-50306 to this issue.


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

	Fixed in 5.15.87 with commit 6969367c1500c15eddc38fda12f6d15518ad6d03
	Fixed in 6.0.6 with commit f234294812c9b68d603650d28743eafb718e7ad5
	Fixed in 6.1 with commit 1b45cc5c7b920fd8bf72e5a888ec7abeadf41e09

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-2022-50306
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/ext4/fast_commit.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/6969367c1500c15eddc38fda12f6d15518ad6d03
	https://git.kernel.org/stable/c/f234294812c9b68d603650d28743eafb718e7ad5
	https://git.kernel.org/stable/c/1b45cc5c7b920fd8bf72e5a888ec7abeadf41e09