linux-cve-announce - CVE-2022-49280: NFSD: prevent underflow in nfssvc_decode

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Message-ID: <2025022631-CVE-2022-49280-8de2@gregkh>
Date: Wed, 26 Feb 2025 02:58:05 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49280: NFSD: prevent underflow in nfssvc_decode_writeargs()

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

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

NFSD: prevent underflow in nfssvc_decode_writeargs()

Smatch complains:

	fs/nfsd/nfsxdr.c:341 nfssvc_decode_writeargs()
	warn: no lower bound on 'args->len'

Change the type to unsigned to prevent this issue.

The Linux kernel CVE team has assigned CVE-2022-49280 to this issue.


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

	Fixed in 4.9.311 with commit 1a33e0de60feda402d05ac8a6cf409c19ea3e0b3
	Fixed in 4.14.276 with commit 438068f4912183a59fcb6b7496a06437f7fd4e2b
	Fixed in 4.19.238 with commit 9f0f048c1bfa7867d565a95fd8c28f4484ba1043
	Fixed in 5.4.189 with commit 85259340fc9bd54e3d567b41b881ecb4d0055da1
	Fixed in 5.10.110 with commit 65e21cc042f4c1518c8c55283f53bc725b78419d
	Fixed in 5.15.33 with commit 614a61e1592051cc42d3c38f899c9f7bdaad8a1d
	Fixed in 5.16.19 with commit 2764af8ce0bf03cc43ee4a11897cab96bde6caae
	Fixed in 5.17.2 with commit 413d8fefafe531a9442bb623e3fe292a38f88d65
	Fixed in 5.18 with commit 184416d4b98509fb4c3d8fc3d6dc1437896cc159

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-2022-49280
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
	fs/nfsd/xdr.h


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/1a33e0de60feda402d05ac8a6cf409c19ea3e0b3
	https://git.kernel.org/stable/c/438068f4912183a59fcb6b7496a06437f7fd4e2b
	https://git.kernel.org/stable/c/9f0f048c1bfa7867d565a95fd8c28f4484ba1043
	https://git.kernel.org/stable/c/85259340fc9bd54e3d567b41b881ecb4d0055da1
	https://git.kernel.org/stable/c/65e21cc042f4c1518c8c55283f53bc725b78419d
	https://git.kernel.org/stable/c/614a61e1592051cc42d3c38f899c9f7bdaad8a1d
	https://git.kernel.org/stable/c/2764af8ce0bf03cc43ee4a11897cab96bde6caae
	https://git.kernel.org/stable/c/413d8fefafe531a9442bb623e3fe292a38f88d65
	https://git.kernel.org/stable/c/184416d4b98509fb4c3d8fc3d6dc1437896cc159