linux-cve-announce - CVE-2023-53033: netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits

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Message-ID: <2025032721-CVE-2023-53033-9089@gregkh>
Date: Thu, 27 Mar 2025 17:44:20 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-53033: netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits

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

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

netfilter: nft_payload: incorrect arithmetics when fetching VLAN header bits

If the offset + length goes over the ethernet + vlan header, then the
length is adjusted to copy the bytes that are within the boundaries of
the vlan_ethhdr scratchpad area. The remaining bytes beyond ethernet +
vlan header are copied directly from the skbuff data area.

Fix incorrect arithmetic operator: subtract, not add, the size of the
vlan header in case of double-tagged packets to adjust the length
accordingly to address CVE-2023-0179.

The Linux kernel CVE team has assigned CVE-2023-53033 to this issue.


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

	Issue introduced in 5.5 with commit f6ae9f120dada00abfb47313364c35118469455f and fixed in 5.10.164 with commit 550efeff989b041f3746118c0ddd863c39ddc1aa
	Issue introduced in 5.5 with commit f6ae9f120dada00abfb47313364c35118469455f and fixed in 5.15.89 with commit a8acfe2c6fb99f9375a9325807a179cd8c32e6e3
	Issue introduced in 5.5 with commit f6ae9f120dada00abfb47313364c35118469455f and fixed in 6.1.7 with commit 76ef74d4a379faa451003621a84e3498044e7aa3
	Issue introduced in 5.5 with commit f6ae9f120dada00abfb47313364c35118469455f and fixed in 6.2 with commit 696e1a48b1a1b01edad542a1ef293665864a4dd0

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-2023-53033
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:
	net/netfilter/nft_payload.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/550efeff989b041f3746118c0ddd863c39ddc1aa
	https://git.kernel.org/stable/c/a8acfe2c6fb99f9375a9325807a179cd8c32e6e3
	https://git.kernel.org/stable/c/76ef74d4a379faa451003621a84e3498044e7aa3
	https://git.kernel.org/stable/c/696e1a48b1a1b01edad542a1ef293665864a4dd0