linux-cve-announce - CVE-2025-38333: f2fs: fix to bail out in get_new

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Message-ID: <2025071033-CVE-2025-38333-a60d@gregkh>
Date: Thu, 10 Jul 2025 10:15:41 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38333: f2fs: fix to bail out in get_new_segment()

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

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

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

f2fs: fix to bail out in get_new_segment()

------------[ cut here ]------------
WARNING: CPU: 3 PID: 579 at fs/f2fs/segment.c:2832 new_curseg+0x5e8/0x6dc
pc : new_curseg+0x5e8/0x6dc
Call trace:
 new_curseg+0x5e8/0x6dc
 f2fs_allocate_data_block+0xa54/0xe28
 do_write_page+0x6c/0x194
 f2fs_do_write_node_page+0x38/0x78
 __write_node_page+0x248/0x6d4
 f2fs_sync_node_pages+0x524/0x72c
 f2fs_write_checkpoint+0x4bc/0x9b0
 __checkpoint_and_complete_reqs+0x80/0x244
 issue_checkpoint_thread+0x8c/0xec
 kthread+0x114/0x1bc
 ret_from_fork+0x10/0x20

get_new_segment() detects inconsistent status in between free_segmap
and free_secmap, let's record such error into super block, and bail
out get_new_segment() instead of continue using the segment.

The Linux kernel CVE team has assigned CVE-2025-38333 to this issue.


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

	Fixed in 6.12.35 with commit f0023d7a2a86999c8e1300e911d92f995a5310a8
	Fixed in 6.15.4 with commit ca860f507a61c7c3d4dde47b830a5c0d555cf83c
	Fixed in 6.16-rc1 with commit bb5eb8a5b222fa5092f60d5555867a05ebc3bdf2

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-2025-38333
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/f2fs/segment.c
	include/linux/f2fs_fs.h


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/f0023d7a2a86999c8e1300e911d92f995a5310a8
	https://git.kernel.org/stable/c/ca860f507a61c7c3d4dde47b830a5c0d555cf83c
	https://git.kernel.org/stable/c/bb5eb8a5b222fa5092f60d5555867a05ebc3bdf2