linux-cve-announce - CVE-2025-38701: ext4: do not BUG when INLINE_DATA

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Message-ID: <2025090453-CVE-2025-38701-691e@gregkh>
Date: Thu,  4 Sep 2025 17:33:06 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38701: ext4: do not BUG when INLINE_DATA_FL lacks system.data xattr

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

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

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

ext4: do not BUG when INLINE_DATA_FL lacks system.data xattr

A syzbot fuzzed image triggered a BUG_ON in ext4_update_inline_data()
when an inode had the INLINE_DATA_FL flag set but was missing the
system.data extended attribute.

Since this can happen due to a maiciouly fuzzed file system, we
shouldn't BUG, but rather, report it as a corrupted file system.

Add similar replacements of BUG_ON with EXT4_ERROR_INODE() ii
ext4_create_inline_data() and ext4_inline_data_truncate().

The Linux kernel CVE team has assigned CVE-2025-38701 to this issue.


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

	Fixed in 5.4.297 with commit 8085a7324d8ec448c4a764af7853e19bbd64e17a
	Fixed in 5.10.241 with commit 1199a6399895f4767f0b9a68a6ff47c3f799b7c7
	Fixed in 5.15.190 with commit 7f322c12df7aeed1755acd3c6fab48c7807795fb
	Fixed in 6.1.149 with commit 2817ac83cb4732597bf36853fe13ca616f4ee4e2
	Fixed in 6.6.103 with commit d960f4b793912f35e9d72bd9d1e90553063fcbf1
	Fixed in 6.12.43 with commit 81e7e2e7ba07e7c8cdce43ccad2f91adbc5a919c
	Fixed in 6.15.11 with commit 279c87ef7b9da34f65c2e4db586e730b667a6fb9
	Fixed in 6.16.2 with commit 8a6f89d42e61788605722dd9faf98797c958a7e5
	Fixed in 6.17-rc1 with commit 099b847ccc6c1ad2f805d13cfbcc83f5b6d4bc42

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-2025-38701
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/ext4/inline.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/8085a7324d8ec448c4a764af7853e19bbd64e17a
	https://git.kernel.org/stable/c/1199a6399895f4767f0b9a68a6ff47c3f799b7c7
	https://git.kernel.org/stable/c/7f322c12df7aeed1755acd3c6fab48c7807795fb
	https://git.kernel.org/stable/c/2817ac83cb4732597bf36853fe13ca616f4ee4e2
	https://git.kernel.org/stable/c/d960f4b793912f35e9d72bd9d1e90553063fcbf1
	https://git.kernel.org/stable/c/81e7e2e7ba07e7c8cdce43ccad2f91adbc5a919c
	https://git.kernel.org/stable/c/279c87ef7b9da34f65c2e4db586e730b667a6fb9
	https://git.kernel.org/stable/c/8a6f89d42e61788605722dd9faf98797c958a7e5
	https://git.kernel.org/stable/c/099b847ccc6c1ad2f805d13cfbcc83f5b6d4bc42