linux-cve-announce - CVE-2022-50348: nfsd: Fix a memory leak in an error handling path

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Message-ID: <2025091640-CVE-2022-50348-534c@gregkh>
Date: Tue, 16 Sep 2025 18:11:44 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50348: nfsd: Fix a memory leak in an error handling path

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

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

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

nfsd: Fix a memory leak in an error handling path

If this memdup_user() call fails, the memory allocated in a previous call
a few lines above should be freed. Otherwise it leaks.

The Linux kernel CVE team has assigned CVE-2022-50348 to this issue.


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

	Issue introduced in 5.4 with commit 6ee95d1c899186c0798cafd25998d436bcdb9618 and fixed in 5.4.220 with commit acc393aecda05bf64ed13b732931462e07a1bf08
	Issue introduced in 5.4 with commit 6ee95d1c899186c0798cafd25998d436bcdb9618 and fixed in 5.10.150 with commit e060c4b9f33c1fca74df26d57a98e784295327e6
	Issue introduced in 5.4 with commit 6ee95d1c899186c0798cafd25998d436bcdb9618 and fixed in 5.15.75 with commit aed8816305575b38dcc77feb6f1bc1d0ed32f5b8
	Issue introduced in 5.4 with commit 6ee95d1c899186c0798cafd25998d436bcdb9618 and fixed in 5.19.17 with commit 733dd17158f96aaa25408dc39bbb2738fda9300e
	Issue introduced in 5.4 with commit 6ee95d1c899186c0798cafd25998d436bcdb9618 and fixed in 6.0.3 with commit cc3bca2110ac85cd964da997ef83d84cab0d49fb
	Issue introduced in 5.4 with commit 6ee95d1c899186c0798cafd25998d436bcdb9618 and fixed in 6.1 with commit fd1ef88049de09bc70d60b549992524cfc0e66ff

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-2022-50348
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/nfsd/nfs4recover.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/acc393aecda05bf64ed13b732931462e07a1bf08
	https://git.kernel.org/stable/c/e060c4b9f33c1fca74df26d57a98e784295327e6
	https://git.kernel.org/stable/c/aed8816305575b38dcc77feb6f1bc1d0ed32f5b8
	https://git.kernel.org/stable/c/733dd17158f96aaa25408dc39bbb2738fda9300e
	https://git.kernel.org/stable/c/cc3bca2110ac85cd964da997ef83d84cab0d49fb
	https://git.kernel.org/stable/c/fd1ef88049de09bc70d60b549992524cfc0e66ff