linux-cve-announce - CVE-2025-37863: ovl: don't allow datadir only

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Message-ID: <2025050956-CVE-2025-37863-dcf9@gregkh>
Date: Fri,  9 May 2025 08:43:57 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37863: ovl: don't allow datadir only

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

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

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

ovl: don't allow datadir only

In theory overlayfs could support upper layer directly referring to a data
layer, but there's no current use case for this.

Originally, when data-only layers were introduced, this wasn't allowed,
only introduced by the "datadir+" feature, but without actually handling
this case, resulting in an Oops.

Fix by disallowing datadir without lowerdir.

The Linux kernel CVE team has assigned CVE-2025-37863 to this issue.


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

	Issue introduced in 6.6.23 with commit cc0918b3582c98f12cfb30bf7496496d14bff3e9 and fixed in 6.6.88 with commit 0874b629f65320778e7e3e206177770666d9db18
	Issue introduced in 6.7 with commit 24e16e385f2272b1a9df51337a5c32d28a29c7ad and fixed in 6.12.25 with commit b9e3579213ba648fa23f780e8d53e99011c62331
	Issue introduced in 6.7 with commit 24e16e385f2272b1a9df51337a5c32d28a29c7ad and fixed in 6.14.4 with commit 21d2ffb0e9838a175064c22f3a9de97d1f56f27d
	Issue introduced in 6.7 with commit 24e16e385f2272b1a9df51337a5c32d28a29c7ad and fixed in 6.15-rc3 with commit eb3a04a8516ee9b5174379306f94279fc90424c4

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-2025-37863
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/overlayfs/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/0874b629f65320778e7e3e206177770666d9db18
	https://git.kernel.org/stable/c/b9e3579213ba648fa23f780e8d53e99011c62331
	https://git.kernel.org/stable/c/21d2ffb0e9838a175064c22f3a9de97d1f56f27d
	https://git.kernel.org/stable/c/eb3a04a8516ee9b5174379306f94279fc90424c4