linux-cve-announce - CVE-2022-50107: cifs: Fix memory leak when using fscache

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Message-ID: <2025061806-CVE-2022-50107-76ef@gregkh>
Date: Wed, 18 Jun 2025 13:02:52 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50107: cifs: Fix memory leak when using fscache

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

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

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

cifs: Fix memory leak when using fscache

If we hit the 'index == next_cached' case, we leak a refcount on the
struct page.  Fix this by using readahead_folio() which takes care of
the refcount for you.

The Linux kernel CVE team has assigned CVE-2022-50107 to this issue.


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

	Issue introduced in 5.17 with commit 0174ee9947bd0f24fee2794b35258960d108b7aa and fixed in 5.18.18 with commit 7105b4047481bc2950fb767cff328d8b75292c0f
	Issue introduced in 5.17 with commit 0174ee9947bd0f24fee2794b35258960d108b7aa and fixed in 5.19.2 with commit ae497726cd090673a4d20ac725ccc2de8067a7a5
	Issue introduced in 5.17 with commit 0174ee9947bd0f24fee2794b35258960d108b7aa and fixed in 6.0 with commit c6f62f81b488d00afaa86bae26c6ce9ab12c709e

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-2022-50107
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/cifs/file.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/7105b4047481bc2950fb767cff328d8b75292c0f
	https://git.kernel.org/stable/c/ae497726cd090673a4d20ac725ccc2de8067a7a5
	https://git.kernel.org/stable/c/c6f62f81b488d00afaa86bae26c6ce9ab12c709e