linux-cve-announce - CVE-2023-54285: iomap: Fix possible overflow condition in iomap_write_delalloc

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Message-ID: <2025123027-CVE-2023-54285-edc0@gregkh>
Date: Tue, 30 Dec 2025 13:23:38 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54285: iomap: Fix possible overflow condition in iomap_write_delalloc_scan

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

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

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

iomap: Fix possible overflow condition in iomap_write_delalloc_scan

folio_next_index() returns an unsigned long value which left shifted
by PAGE_SHIFT could possibly cause an overflow on 32-bit system. Instead
use folio_pos(folio) + folio_size(folio), which does this correctly.

The Linux kernel CVE team has assigned CVE-2023-54285 to this issue.


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

	Fixed in 6.5.5 with commit 5c281b0c5d18c8eeb1cfd5023f4adb153e6d1240
	Fixed in 6.6 with commit eee2d2e6ea5550118170dbd5bb1316ceb38455fb

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-2023-54285
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/iomap/buffered-io.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/5c281b0c5d18c8eeb1cfd5023f4adb153e6d1240
	https://git.kernel.org/stable/c/eee2d2e6ea5550118170dbd5bb1316ceb38455fb