linux-cve-announce - CVE-2023-53695: udf: Detect system inodes linked into directory hierarchy

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Message-ID: <2025102210-CVE-2023-53695-f553@gregkh>
Date: Wed, 22 Oct 2025 15:24:34 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53695: udf: Detect system inodes linked into directory hierarchy

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

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

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

udf: Detect system inodes linked into directory hierarchy

When UDF filesystem is corrupted, hidden system inodes can be linked
into directory hierarchy which is an avenue for further serious
corruption of the filesystem and kernel confusion as noticed by syzbot
fuzzed images. Refuse to access system inodes linked into directory
hierarchy and vice versa.

The Linux kernel CVE team has assigned CVE-2023-53695 to this issue.


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

	Fixed in 4.19.278 with commit 1dc71eeb198a8daa17d0c995998a53b0b749a158
	Fixed in 5.4.235 with commit d747b31e2925a2f384e7dd1901a2e5bc5f984ed8
	Fixed in 5.10.173 with commit a44ec34b90440ada190924f5908b97026504fdcd
	Fixed in 5.15.99 with commit 37e74003d81e79457535cbbdfa1603431c03fac0
	Fixed in 6.1.16 with commit 1f328751b65c49c13a312d67a3bf27766b85baf7
	Fixed in 6.2.3 with commit 9e3b5ef7d02eaa6553e79b4af9bd99227280f245
	Fixed in 6.3 with commit 85a37983ec69cc9fcd188bc37c4de15ee326355a

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-2023-53695
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/udf/inode.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/1dc71eeb198a8daa17d0c995998a53b0b749a158
	https://git.kernel.org/stable/c/d747b31e2925a2f384e7dd1901a2e5bc5f984ed8
	https://git.kernel.org/stable/c/a44ec34b90440ada190924f5908b97026504fdcd
	https://git.kernel.org/stable/c/37e74003d81e79457535cbbdfa1603431c03fac0
	https://git.kernel.org/stable/c/1f328751b65c49c13a312d67a3bf27766b85baf7
	https://git.kernel.org/stable/c/9e3b5ef7d02eaa6553e79b4af9bd99227280f245
	https://git.kernel.org/stable/c/85a37983ec69cc9fcd188bc37c4de15ee326355a