linux-cve-announce - CVE-2022-50448: mm/uffd: fix warning without PTE_MARKER_UFFD

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Message-ID: <2025100116-CVE-2022-50448-922e@gregkh>
Date: Wed,  1 Oct 2025 13:45:18 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50448: mm/uffd: fix warning without PTE_MARKER_UFFD_WP compiled in

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

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

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

mm/uffd: fix warning without PTE_MARKER_UFFD_WP compiled in

When PTE_MARKER_UFFD_WP not configured, it's still possible to reach pte
marker code and trigger an warning. Add a few CONFIG_PTE_MARKER_UFFD_WP
ifdefs to make sure the code won't be reached when not compiled in.

The Linux kernel CVE team has assigned CVE-2022-50448 to this issue.


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

	Issue introduced in 5.19 with commit b1f9e876862d8f7176299ec4fb2108bc1045cbc8 and fixed in 5.19.17 with commit b76e4eb02e9edb9a0a51942acdb373ca01346e8c
	Issue introduced in 5.19 with commit b1f9e876862d8f7176299ec4fb2108bc1045cbc8 and fixed in 6.0.3 with commit 2204a880cb0c51952463a24a4fa01a6514c5a25a
	Issue introduced in 5.19 with commit b1f9e876862d8f7176299ec4fb2108bc1045cbc8 and fixed in 6.1 with commit 515778e2d790652a38a24554fdb7f21420d91efc

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-2022-50448
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:
	mm/hugetlb.c
	mm/memory.c
	mm/mprotect.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/b76e4eb02e9edb9a0a51942acdb373ca01346e8c
	https://git.kernel.org/stable/c/2204a880cb0c51952463a24a4fa01a6514c5a25a
	https://git.kernel.org/stable/c/515778e2d790652a38a24554fdb7f21420d91efc