CVE-2026-80868: ntfs3: Allocate iomap inline_data using alloc_page

CVE-2026-80868: ntfs3: Allocate iomap inline_data using alloc_page

[Greg Kroah-Hartman]

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

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

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

ntfs3: Allocate iomap inline_data using alloc_page

This fixes a BUG reported in iomap_write_end_inline:
iomap_inline_data_valid checks that the inline_data fits within
a page. If the inline_data is allocated with kmemdup there's no
guarantee that it's page-aligned, so the check sometimes fails.
Allocate it with alloc_page to ensure it's page-aligned.

The Linux kernel CVE team has assigned CVE-2026-80868 to this issue.


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

	Issue introduced in 7.0 with commit 099ef9ab9203dff327f2d61e44773f9acbc01f13 and fixed in 7.1.5 with commit 3cd2212012c06d2b1fd03a6bf84f6202ab70056c
	Issue introduced in 7.0 with commit 099ef9ab9203dff327f2d61e44773f9acbc01f13 and fixed in 7.2 with commit 70d3855594cf6e8791970714b65cac3202d6160e

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-2026-80868
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/ntfs3/attrib.c
	fs/ntfs3/inode.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/3cd2212012c06d2b1fd03a6bf84f6202ab70056c
	https://git.kernel.org/stable/c/70d3855594cf6e8791970714b65cac3202d6160e