linux-cve-announce - CVE-2022-50205: ext2: Add more validity checks for inode counts

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Message-ID: <2025061841-CVE-2022-50205-4197@gregkh>
Date: Wed, 18 Jun 2025 13:04:30 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50205: ext2: Add more validity checks for inode counts

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

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

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

ext2: Add more validity checks for inode counts

Add checks verifying number of inodes stored in the superblock matches
the number computed from number of inodes per group. Also verify we have
at least one block worth of inodes per group. This prevents crashes on
corrupted filesystems.

The Linux kernel CVE team has assigned CVE-2022-50205 to this issue.


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

	Fixed in 4.14.291 with commit 0bcdc31094a12b4baf59e241feabc9787cf635fa
	Fixed in 4.19.256 with commit 07303a9abe3a997d9864fb4315e34b5acfe8fc25
	Fixed in 5.4.211 with commit b3f423683818cfe15de14d5d9dff44148ff16bbf
	Fixed in 5.10.137 with commit d08bb199a406424a8ed0009efdf41710e6d849ee
	Fixed in 5.15.61 with commit 96b18d3a1be0354ccce43f0ef61b5a3d7e432552
	Fixed in 5.18.18 with commit 7a48fdc88a3c35e046a6a0a38eba00f21c65b16e
	Fixed in 5.19.2 with commit 5e63c5fe9123fa76ffaeff26c211308736ec3a07
	Fixed in 6.0 with commit fa78f336937240d1bc598db817d638086060e7e9

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-2022-50205
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/ext2/super.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/0bcdc31094a12b4baf59e241feabc9787cf635fa
	https://git.kernel.org/stable/c/07303a9abe3a997d9864fb4315e34b5acfe8fc25
	https://git.kernel.org/stable/c/b3f423683818cfe15de14d5d9dff44148ff16bbf
	https://git.kernel.org/stable/c/d08bb199a406424a8ed0009efdf41710e6d849ee
	https://git.kernel.org/stable/c/96b18d3a1be0354ccce43f0ef61b5a3d7e432552
	https://git.kernel.org/stable/c/7a48fdc88a3c35e046a6a0a38eba00f21c65b16e
	https://git.kernel.org/stable/c/5e63c5fe9123fa76ffaeff26c211308736ec3a07
	https://git.kernel.org/stable/c/fa78f336937240d1bc598db817d638086060e7e9