CVE-2026-72355: netfs: Fix barriering when walking subrequest list

CVE-2026-72355: netfs: Fix barriering when walking subrequest list

[Greg Kroah-Hartman]

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

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

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

netfs: Fix barriering when walking subrequest list

Fix the barriering used when walking the subrequest list in retry as
there's a possibility of seeing a subreq that's just been added by the
application thread.

The Linux kernel CVE team has assigned CVE-2026-72355 to this issue.


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

	Issue introduced in 6.10 with commit 288ace2f57c9d06dd2e42bd80d03747d879a4068 and fixed in 7.1.5 with commit be47c047250671c9225c0319ca4695be9b391c59
	Issue introduced in 6.10 with commit 288ace2f57c9d06dd2e42bd80d03747d879a4068 and fixed in 7.2-rc2 with commit 5c6ce05e406520290c1d89da97fb3cd70c09137d

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-2026-72355
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/netfs/read_retry.c
	fs/netfs/write_retry.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/be47c047250671c9225c0319ca4695be9b391c59
	https://git.kernel.org/stable/c/5c6ce05e406520290c1d89da97fb3cd70c09137d