linux-cve-announce - CVE-2022-50065: virtio_net: fix memory leak inside XPD

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Message-ID: <2025061851-CVE-2022-50065-b627@gregkh>
Date: Wed, 18 Jun 2025 13:02:10 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50065: virtio_net: fix memory leak inside XPD_TX with mergeable

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

virtio_net: fix memory leak inside XPD_TX with mergeable

When we call xdp_convert_buff_to_frame() to get xdpf, if it returns
NULL, we should check if xdp_page was allocated by xdp_linearize_page().
If it is newly allocated, it should be freed here alone. Just like any
other "goto err_xdp".

The Linux kernel CVE team has assigned CVE-2022-50065 to this issue.


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

	Issue introduced in 4.18 with commit 44fa2dbd475996ddc8f3a0e6113dee983e0ee3aa and fixed in 5.10.138 with commit faafa2a87f697ee537c29446097e1cc3143506fa
	Issue introduced in 4.18 with commit 44fa2dbd475996ddc8f3a0e6113dee983e0ee3aa and fixed in 5.15.63 with commit d3723eab11196475ef83279571b2b0bd0924cf82
	Issue introduced in 4.18 with commit 44fa2dbd475996ddc8f3a0e6113dee983e0ee3aa and fixed in 5.19.4 with commit 18e383afbd7047af7b055df6e25436e0ce28f8a5
	Issue introduced in 4.18 with commit 44fa2dbd475996ddc8f3a0e6113dee983e0ee3aa and fixed in 6.0 with commit 7a542bee27c6a57e45c33cbbdc963325fd6493af

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-2022-50065
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:
	drivers/net/virtio_net.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/faafa2a87f697ee537c29446097e1cc3143506fa
	https://git.kernel.org/stable/c/d3723eab11196475ef83279571b2b0bd0924cf82
	https://git.kernel.org/stable/c/18e383afbd7047af7b055df6e25436e0ce28f8a5
	https://git.kernel.org/stable/c/7a542bee27c6a57e45c33cbbdc963325fd6493af