linux-cve-announce - CVE-2022-49339: net: ipv6: unexport __init-annotated seg6_hmac

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Message-ID: <2025022640-CVE-2022-49339-8220@gregkh>
Date: Wed, 26 Feb 2025 03:10:13 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49339: net: ipv6: unexport __init-annotated seg6_hmac_init()

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

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

net: ipv6: unexport __init-annotated seg6_hmac_init()

EXPORT_SYMBOL and __init is a bad combination because the .init.text
section is freed up after the initialization. Hence, modules cannot
use symbols annotated __init. The access to a freed symbol may end up
with kernel panic.

modpost used to detect it, but it has been broken for a decade.

Recently, I fixed modpost so it started to warn it again, then this
showed up in linux-next builds.

There are two ways to fix it:

  - Remove __init
  - Remove EXPORT_SYMBOL

I chose the latter for this case because the caller (net/ipv6/seg6.c)
and the callee (net/ipv6/seg6_hmac.c) belong to the same module.
It seems an internal function call in ipv6.ko.

The Linux kernel CVE team has assigned CVE-2022-49339 to this issue.


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

	Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 4.14.283 with commit 64aef8efe96c1616142c4476a05731306fc4494e
	Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 4.19.247 with commit ab8b2c2de273ec1d698a18e399896a6febb5cda0
	Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 5.4.198 with commit 317260b3eb6384a05a8af212308fa50f3b2e8290
	Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 5.10.122 with commit 5d9c1b081ad28c852a97e10dd75412546497694a
	Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 5.15.47 with commit 1084716f76c8045eadf92a9d9a62641f3c8d8c90
	Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 5.17.15 with commit 3e6de5037148c5a93a436b1e8d2edad3dac11755
	Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 5.18.4 with commit 9ba4416b831eeb4d185e88e73488d1d21288e63a
	Issue introduced in 4.10 with commit bf355b8d2c30a289232042cacc1cfaea4923936c and fixed in 5.19 with commit 5801f064e35181c71857a80ff18af4dbec3c5f5c

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-2022-49339
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/ipv6/seg6_hmac.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/64aef8efe96c1616142c4476a05731306fc4494e
	https://git.kernel.org/stable/c/ab8b2c2de273ec1d698a18e399896a6febb5cda0
	https://git.kernel.org/stable/c/317260b3eb6384a05a8af212308fa50f3b2e8290
	https://git.kernel.org/stable/c/5d9c1b081ad28c852a97e10dd75412546497694a
	https://git.kernel.org/stable/c/1084716f76c8045eadf92a9d9a62641f3c8d8c90
	https://git.kernel.org/stable/c/3e6de5037148c5a93a436b1e8d2edad3dac11755
	https://git.kernel.org/stable/c/9ba4416b831eeb4d185e88e73488d1d21288e63a
	https://git.kernel.org/stable/c/5801f064e35181c71857a80ff18af4dbec3c5f5c