linux-cve-announce - CVE-2023-53569: ext2: Check block size validity during mount

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Message-ID: <2025100452-CVE-2023-53569-181e@gregkh>
Date: Sat,  4 Oct 2025 17:17:23 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53569: ext2: Check block size validity during mount

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

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

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

ext2: Check block size validity during mount

Check that log of block size stored in the superblock has sensible
value. Otherwise the shift computing the block size can overflow leading
to undefined behavior.

The Linux kernel CVE team has assigned CVE-2023-53569 to this issue.


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

	Fixed in 4.14.316 with commit 0ebfaf14150f55550cffb1148ed3920143c7a69c
	Fixed in 4.19.284 with commit 451b98155be5dfee05bc6e7c8b30c0be4add3f71
	Fixed in 5.4.244 with commit c4813f858e5c3e4c4659ce95385c1c400c593e1e
	Fixed in 5.10.181 with commit 22ab5fed07ad4b206ea910fd0132d1a0d4831584
	Fixed in 5.15.113 with commit 99f8a15af6c9f0653193104a9e70891f950c6001
	Fixed in 6.1.30 with commit e6f4fb28890c1361e0db9eb1adee3fc04e7fe7f5
	Fixed in 6.3.4 with commit c2e7776843a953fd7e48895c3880c277f996193e
	Fixed in 6.4 with commit 62aeb94433fcec80241754b70d0d1836d5926b0a

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-2023-53569
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/ext2.h
	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/0ebfaf14150f55550cffb1148ed3920143c7a69c
	https://git.kernel.org/stable/c/451b98155be5dfee05bc6e7c8b30c0be4add3f71
	https://git.kernel.org/stable/c/c4813f858e5c3e4c4659ce95385c1c400c593e1e
	https://git.kernel.org/stable/c/22ab5fed07ad4b206ea910fd0132d1a0d4831584
	https://git.kernel.org/stable/c/99f8a15af6c9f0653193104a9e70891f950c6001
	https://git.kernel.org/stable/c/e6f4fb28890c1361e0db9eb1adee3fc04e7fe7f5
	https://git.kernel.org/stable/c/c2e7776843a953fd7e48895c3880c277f996193e
	https://git.kernel.org/stable/c/62aeb94433fcec80241754b70d0d1836d5926b0a