linux-cve-announce - CVE-2024-27017: netfilter: nft_set_pipapo: walk over current view on netlink dump

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Date: Wed,  1 May 2024 07:31:18 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-27017: netfilter: nft_set_pipapo: walk over current view on netlink dump

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

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

netfilter: nft_set_pipapo: walk over current view on netlink dump

The generation mask can be updated while netlink dump is in progress.
The pipapo set backend walk iterator cannot rely on it to infer what
view of the datastructure is to be used. Add notation to specify if user
wants to read/update the set.

Based on patch from Florian Westphal.

The Linux kernel CVE team has assigned CVE-2024-27017 to this issue.


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

	Issue introduced in 6.4 with commit 2b84e215f874 and fixed in 6.8.8 with commit 721715655c72
	Issue introduced in 6.4 with commit 2b84e215f874 and fixed in 6.9-rc5 with commit 29b359cf6d95
	Issue introduced in 5.10.186 with commit 2a90da8e0dd5
	Issue introduced in 5.15.119 with commit 45eb6944d0f5
	Issue introduced in 6.1.36 with commit 0d836f917520
	Issue introduced in 6.3.10 with commit f661383b5f1a

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-2024-27017
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:
	include/net/netfilter/nf_tables.h
	net/netfilter/nf_tables_api.c
	net/netfilter/nft_set_pipapo.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/721715655c72640567e8742567520c99801148ed
	https://git.kernel.org/stable/c/29b359cf6d95fd60730533f7f10464e95bd17c73