linux-cve-announce - CVE-2025-21667: iomap: avoid avoid truncating 64-bit offset to 32 bits

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Message-ID: <2025013158-CVE-2025-21667-a644@gregkh>
Date: Fri, 31 Jan 2025 12:30:59 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21667: iomap: avoid avoid truncating 64-bit offset to 32 bits

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

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

iomap: avoid avoid truncating 64-bit offset to 32 bits

on 32-bit kernels, iomap_write_delalloc_scan() was inadvertently using a
32-bit position due to folio_next_index() returning an unsigned long.
This could lead to an infinite loop when writing to an xfs filesystem.

The Linux kernel CVE team has assigned CVE-2025-21667 to this issue.


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

	Fixed in 6.1.127 with commit 7ca4bd6b754913910151acce00be093f03642725
	Fixed in 6.6.74 with commit 91371922704c8d82049ef7c2ad974d0a2cd1174d
	Fixed in 6.12.11 with commit 402ce16421477e27f30b57d6d1a6dc248fa3a4e4
	Fixed in 6.13 with commit c13094b894de289514d84b8db56d1f2931a0bade

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-2025-21667
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/7ca4bd6b754913910151acce00be093f03642725
	https://git.kernel.org/stable/c/91371922704c8d82049ef7c2ad974d0a2cd1174d
	https://git.kernel.org/stable/c/402ce16421477e27f30b57d6d1a6dc248fa3a4e4
	https://git.kernel.org/stable/c/c13094b894de289514d84b8db56d1f2931a0bade