linux-cve-announce - CVE-2022-49497: net: remove two BUG() from skb_checksum

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Message-ID: <2025022607-CVE-2022-49497-bfc0@gregkh>
Date: Wed, 26 Feb 2025 03:12:51 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49497: net: remove two BUG() from skb_checksum_help()

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

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

net: remove two BUG() from skb_checksum_help()

I have a syzbot report that managed to get a crash in skb_checksum_help()

If syzbot can trigger these BUG(), it makes sense to replace
them with more friendly WARN_ON_ONCE() since skb_checksum_help()
can instead return an error code.

Note that syzbot will still crash there, until real bug is fixed.

The Linux kernel CVE team has assigned CVE-2022-49497 to this issue.


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

	Fixed in 5.10.121 with commit 312c43e98ed190bd8fd7a71a0addf9539d5b8ab1
	Fixed in 5.15.46 with commit 6320ae1b5876c30bf98203b6a5abe8b5c45e6a04
	Fixed in 5.17.14 with commit d5281245f3502e960cb6b89348767b935379cee3
	Fixed in 5.18.3 with commit b1320c9a4d30ff54b824a8ad6036e0b5fb4c5e73
	Fixed in 5.19 with commit d7ea0d9df2a6265b2b180d17ebc64b38105968fc

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-2022-49497
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/core/dev.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/312c43e98ed190bd8fd7a71a0addf9539d5b8ab1
	https://git.kernel.org/stable/c/6320ae1b5876c30bf98203b6a5abe8b5c45e6a04
	https://git.kernel.org/stable/c/d5281245f3502e960cb6b89348767b935379cee3
	https://git.kernel.org/stable/c/b1320c9a4d30ff54b824a8ad6036e0b5fb4c5e73
	https://git.kernel.org/stable/c/d7ea0d9df2a6265b2b180d17ebc64b38105968fc