linux-cve-announce - CVE-2025-68315: f2fs: fix to detect potential corrupted nid in free_nid

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Message-ID: <2025121655-CVE-2025-68315-158d@gregkh>
Date: Tue, 16 Dec 2025 16:39:58 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68315: f2fs: fix to detect potential corrupted nid in free_nid_list

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

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

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

f2fs: fix to detect potential corrupted nid in free_nid_list

As reported, on-disk footer.ino and footer.nid is the same and
out-of-range, let's add sanity check on f2fs_alloc_nid() to detect
any potential corruption in free_nid_list.

The Linux kernel CVE team has assigned CVE-2025-68315 to this issue.


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

	Fixed in 6.12.58 with commit 6b9525596a83cd5b7bbc2c7bd5f9ad9cf5ad60fa
	Fixed in 6.17.8 with commit adbcb34f03abb89e681a5907c4c3ce4bf224991d
	Fixed in 6.18 with commit 8fc6056dcf79937c46c97fa4996cda65956437a9

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-2025-68315
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/node.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/6b9525596a83cd5b7bbc2c7bd5f9ad9cf5ad60fa
	https://git.kernel.org/stable/c/adbcb34f03abb89e681a5907c4c3ce4bf224991d
	https://git.kernel.org/stable/c/8fc6056dcf79937c46c97fa4996cda65956437a9