linux-cve-announce - CVE-2022-50235: NFSD: Protect against send buffer overflow in NFSv2 READDIR

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Message-ID: <2025091547-CVE-2022-50235-a5c0@gregkh>
Date: Mon, 15 Sep 2025 16:01:45 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50235: NFSD: Protect against send buffer overflow in NFSv2 READDIR

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

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

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

NFSD: Protect against send buffer overflow in NFSv2 READDIR

Restore the previous limit on the @count argument to prevent a
buffer overflow attack.

The Linux kernel CVE team has assigned CVE-2022-50235 to this issue.


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

	Issue introduced in 5.15.12 with commit eabc0aab98e5218ceecd82069b0d6fdfff5ee885 and fixed in 5.15.75 with commit dc7f225090c29a5f3b9419b1af32846a201555e7
	Issue introduced in 5.16 with commit 53b1119a6e5028b125f431a0116ba73510d82a72 and fixed in 5.19.17 with commit c2a878095b5c6f04f90553a3c45872f990dab14e
	Issue introduced in 5.16 with commit 53b1119a6e5028b125f431a0116ba73510d82a72 and fixed in 6.0.3 with commit f59c74df82f6ac9d2ea4e01aa3ae7c6c4481652d
	Issue introduced in 5.16 with commit 53b1119a6e5028b125f431a0116ba73510d82a72 and fixed in 6.1 with commit 00b4492686e0497fdb924a9d4c8f6f99377e176c

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-2022-50235
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/nfsproc.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/0e57d696f60dee6117a8ace0cac7c5761d375277
	https://git.kernel.org/stable/c/dc7f225090c29a5f3b9419b1af32846a201555e7
	https://git.kernel.org/stable/c/c2a878095b5c6f04f90553a3c45872f990dab14e
	https://git.kernel.org/stable/c/f59c74df82f6ac9d2ea4e01aa3ae7c6c4481652d
	https://git.kernel.org/stable/c/00b4492686e0497fdb924a9d4c8f6f99377e176c