CVE-2026-72207: ntfs: not change 0-byte $DATA attribute to non-resident

CVE-2026-72207: ntfs: not change 0-byte $DATA attribute to non-resident

[Greg Kroah-Hartman]

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

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

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

ntfs: not change 0-byte $DATA attribute to non-resident

When ntfs_resident_attr_resize() cannot grow a resident attribute in
place, it retries after converting other resident attributes to
non-resident to free space in the MFT recrord.

Do not select zero-length resident $DATA attributes for this conversion.
fsck treats 0-byte non-resident $DATA attribute as corruptions.

The Linux kernel CVE team has assigned CVE-2026-72207 to this issue.


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

	Fixed in 7.1.5 with commit ceb49c37250125d418410988f2376ed4d57a6706
	Fixed in 7.2-rc1 with commit 0aad21570197973af4a1b25b3fb8ed3aeb9e7670

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-2026-72207
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/ntfs/attrib.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/ceb49c37250125d418410988f2376ed4d57a6706
	https://git.kernel.org/stable/c/0aad21570197973af4a1b25b3fb8ed3aeb9e7670