Subject: CVE-2024-27016: netfilter: flowtable: validate pppoe header

From: Greg Kroah-Hartman <[email-masked]>

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

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

netfilter: flowtable: validate pppoe header

Ensure there is sufficient room to access the protocol field of the
PPPoe header. Validate it once before the flowtable lookup, then use a
helper function to access protocol field.

The Linux kernel CVE team has assigned CVE-2024-27016 to this issue.

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

	Issue introduced in 5.13 with commit 72efd585f714 and fixed in 5.15.157 with commit d06977b9a410
	Issue introduced in 5.13 with commit 72efd585f714 and fixed in 6.1.88 with commit 8bf7c76a2a20
	Issue introduced in 5.13 with commit 72efd585f714 and fixed in 6.6.29 with commit a2471d271042
	Issue introduced in 5.13 with commit 72efd585f714 and fixed in 6.8.8 with commit cf366ee3bc1b
	Issue introduced in 5.13 with commit 72efd585f714 and fixed in 6.9 with commit 87b3593bed18

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-2024-27016
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_flow_table.h
	net/netfilter/nf_flow_table_inet.c
	net/netfilter/nf_flow_table_ip.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/d06977b9a4109f8738bb276125eb6a0b772bc433
	https://git.kernel.org/stable/c/8bf7c76a2a207ca2b4cfda0a279192adf27678d7
	https://git.kernel.org/stable/c/a2471d271042ea18e8a6babc132a8716bb2f08b9
	https://git.kernel.org/stable/c/cf366ee3bc1b7d1c76a882640ba3b3f8f1039163
	https://git.kernel.org/stable/c/87b3593bed1868b2d9fe096c01bcdf0ea86cbebf