linux-cve-announce - CVE-2022-50006: NFSv4.2 fix problems with __nfs42_ssc

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Message-ID: <2025061830-CVE-2022-50006-6d77@gregkh>
Date: Wed, 18 Jun 2025 13:01:11 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50006: NFSv4.2 fix problems with __nfs42_ssc_open

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

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

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

NFSv4.2 fix problems with __nfs42_ssc_open

A destination server while doing a COPY shouldn't accept using the
passed in filehandle if its not a regular filehandle.

If alloc_file_pseudo() has failed, we need to decrement a reference
on the newly created inode, otherwise it leaks.

The Linux kernel CVE team has assigned CVE-2022-50006 to this issue.


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

	Issue introduced in 5.5 with commit ec4b0925089826af45e99cdf78a8ac84c1d005f1 and fixed in 5.10.140 with commit 5e49ea099850feadcbf33c74b4f514a3e8049b91
	Issue introduced in 5.5 with commit ec4b0925089826af45e99cdf78a8ac84c1d005f1 and fixed in 5.15.64 with commit 5626f95356111602ad26fc05445a4d1f818a0992
	Issue introduced in 5.5 with commit ec4b0925089826af45e99cdf78a8ac84c1d005f1 and fixed in 5.19.6 with commit c2a47f6903e270c308c40ad4a23c17b30a54373c
	Issue introduced in 5.5 with commit ec4b0925089826af45e99cdf78a8ac84c1d005f1 and fixed in 6.0 with commit fcfc8be1e9cf2f12b50dce8b579b3ae54443a014

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-2022-50006
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/nfs/nfs4file.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/5e49ea099850feadcbf33c74b4f514a3e8049b91
	https://git.kernel.org/stable/c/5626f95356111602ad26fc05445a4d1f818a0992
	https://git.kernel.org/stable/c/c2a47f6903e270c308c40ad4a23c17b30a54373c
	https://git.kernel.org/stable/c/fcfc8be1e9cf2f12b50dce8b579b3ae54443a014