linux-cve-announce - CVE-2022-49972: xsk: Fix corrupted packets for XDP_SHARED

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Message-ID: <2025061818-CVE-2022-49972-651b@gregkh>
Date: Wed, 18 Jun 2025 13:00:37 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49972: xsk: Fix corrupted packets for XDP_SHARED_UMEM

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

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

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

xsk: Fix corrupted packets for XDP_SHARED_UMEM

Fix an issue in XDP_SHARED_UMEM mode together with aligned mode where
packets are corrupted for the second and any further sockets bound to
the same umem. In other words, this does not affect the first socket
bound to the umem. The culprit for this bug is that the initialization
of the DMA addresses for the pre-populated xsk buffer pool entries was
not performed for any socket but the first one bound to the umem. Only
the linear array of DMA addresses was populated. Fix this by populating
the DMA addresses in the xsk buffer pool for every socket bound to the
same umem.

The Linux kernel CVE team has assigned CVE-2022-49972 to this issue.

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

	Issue introduced in 5.16 with commit 94033cd8e73b8632bab7c8b7bb54caa4f5616db7 and fixed in 5.19.8 with commit 2c75891d56ab6fe5ba0d415bfad91d514a4027cd
	Issue introduced in 5.16 with commit 94033cd8e73b8632bab7c8b7bb54caa4f5616db7 and fixed in 6.0 with commit 58ca14ed98c87cfe0d1408cc65a9745d9e9b7a56

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-2022-49972
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/xdp/xsk_buff_pool.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/2c75891d56ab6fe5ba0d415bfad91d514a4027cd
	https://git.kernel.org/stable/c/58ca14ed98c87cfe0d1408cc65a9745d9e9b7a56