linux-cve-announce - CVE-2024-50241: NFSD: Initialize struct nfsd4

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Message-ID: <2024110933-CVE-2024-50241-9744@gregkh>
Date: Sat,  9 Nov 2024 11:15:49 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50241: NFSD: Initialize struct nfsd4_copy earlier

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

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

NFSD: Initialize struct nfsd4_copy earlier

Ensure the refcount and async_copies fields are initialized early.
cleanup_async_copy() will reference these fields if an error occurs
in nfsd4_copy(). If they are not correctly initialized, at the very
least, a refcount underflow occurs.

The Linux kernel CVE team has assigned CVE-2024-50241 to this issue.


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

	Issue introduced in 6.11.3 with commit 6a488ad7745b and fixed in 6.11.7 with commit e30a9a2f69c3
	Issue introduced in 6.12-rc1 with commit aadc3bbea163 and fixed in 6.12-rc6 with commit 63fab04cbd0f
	Issue introduced in 6.10.14 with commit b4e21431a0db

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-2024-50241
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/nfs4proc.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/e30a9a2f69c34a00a3cb4fd45c5d231929e66fb1
	https://git.kernel.org/stable/c/63fab04cbd0f96191b6e5beedc3b643b01c15889