linux-cve-announce - CVE-2025-68361: erofs: limit the level of fs stacking for file-backed mounts

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Message-ID: <2025122457-CVE-2025-68361-83eb@gregkh>
Date: Wed, 24 Dec 2025 11:35:06 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68361: erofs: limit the level of fs stacking for file-backed mounts

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

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

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

erofs: limit the level of fs stacking for file-backed mounts

Otherwise, it could cause potential kernel stack overflow (e.g., EROFS
mounting itself).

The Linux kernel CVE team has assigned CVE-2025-68361 to this issue.


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

	Issue introduced in 6.12 with commit fb176750266a3d7f42ebdcf28e8ba40350b27847 and fixed in 6.12.63 with commit 34447aeedbaea8f9aad3da5b07030a1c0e124639
	Issue introduced in 6.12 with commit fb176750266a3d7f42ebdcf28e8ba40350b27847 and fixed in 6.17.13 with commit b4911825348a494e894e6ccfcf88d99e9425f129
	Issue introduced in 6.12 with commit fb176750266a3d7f42ebdcf28e8ba40350b27847 and fixed in 6.18.2 with commit 620472e6b303c4dbcc7ecf1aba1cda4f3523e4a4
	Issue introduced in 6.12 with commit fb176750266a3d7f42ebdcf28e8ba40350b27847 and fixed in 6.19-rc1 with commit d53cd891f0e4311889349fff3a784dc552f814b9

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-2025-68361
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/erofs/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/34447aeedbaea8f9aad3da5b07030a1c0e124639
	https://git.kernel.org/stable/c/b4911825348a494e894e6ccfcf88d99e9425f129
	https://git.kernel.org/stable/c/620472e6b303c4dbcc7ecf1aba1cda4f3523e4a4
	https://git.kernel.org/stable/c/d53cd891f0e4311889349fff3a784dc552f814b9