linux-cve-announce - CVE-2022-50167: bpf: fix potential 32-bit overflow when accessing ARRAY map element

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Message-ID: <2025061827-CVE-2022-50167-e4bf@gregkh>
Date: Wed, 18 Jun 2025 13:03:52 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50167: bpf: fix potential 32-bit overflow when accessing ARRAY map element

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

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

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

bpf: fix potential 32-bit overflow when accessing ARRAY map element

If BPF array map is bigger than 4GB, element pointer calculation can
overflow because both index and elem_size are u32. Fix this everywhere
by forcing 64-bit multiplication. Extract this formula into separate
small helper and use it consistently in various places.

Speculative-preventing formula utilizing index_mask trick is left as is,
but explicit u64 casts are added in both places.

The Linux kernel CVE team has assigned CVE-2022-50167 to this issue.


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

	Issue introduced in 5.3 with commit c85d69135a9175c50a823d04d62d932312d037b3 and fixed in 5.18.18 with commit 063e092534d4c6785228e5b1eb6e9329f66ccbe4
	Issue introduced in 5.3 with commit c85d69135a9175c50a823d04d62d932312d037b3 and fixed in 5.19.2 with commit 3c7256b880b3a5aa1895fd169a34aa4224a11862
	Issue introduced in 5.3 with commit c85d69135a9175c50a823d04d62d932312d037b3 and fixed in 6.0 with commit 87ac0d600943994444e24382a87aa19acc4cd3d4

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-2022-50167
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:
	kernel/bpf/arraymap.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/063e092534d4c6785228e5b1eb6e9329f66ccbe4
	https://git.kernel.org/stable/c/3c7256b880b3a5aa1895fd169a34aa4224a11862
	https://git.kernel.org/stable/c/87ac0d600943994444e24382a87aa19acc4cd3d4