CVE-2022-49339

published 2025-02-26

CVE-2022-49339: 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…

Priority P4 20 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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.

Affected

22 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.18.5-1 (bookworm)	linux 5.18.5-1 (bookworm)
linux	linux	—	—
linux	linux	>= bf355b8d2c30a289232042cacc1cfaea4923936c < 64aef8efe96c1616142c4476a05731306fc4494e	64aef8efe96c1616142c4476a05731306fc4494e
linux	linux	>= bf355b8d2c30a289232042cacc1cfaea4923936c < ab8b2c2de273ec1d698a18e399896a6febb5cda0	ab8b2c2de273ec1d698a18e399896a6febb5cda0
linux	linux	>= bf355b8d2c30a289232042cacc1cfaea4923936c < 317260b3eb6384a05a8af212308fa50f3b2e8290	317260b3eb6384a05a8af212308fa50f3b2e8290
linux	linux	>= bf355b8d2c30a289232042cacc1cfaea4923936c < 5d9c1b081ad28c852a97e10dd75412546497694a	5d9c1b081ad28c852a97e10dd75412546497694a
linux	linux	>= bf355b8d2c30a289232042cacc1cfaea4923936c < 1084716f76c8045eadf92a9d9a62641f3c8d8c90	1084716f76c8045eadf92a9d9a62641f3c8d8c90
linux	linux	>= bf355b8d2c30a289232042cacc1cfaea4923936c < 3e6de5037148c5a93a436b1e8d2edad3dac11755	3e6de5037148c5a93a436b1e8d2edad3dac11755
linux	linux	>= bf355b8d2c30a289232042cacc1cfaea4923936c < 9ba4416b831eeb4d185e88e73488d1d21288e63a	9ba4416b831eeb4d185e88e73488d1d21288e63a
linux	linux	>= bf355b8d2c30a289232042cacc1cfaea4923936c < 5801f064e35181c71857a80ff18af4dbec3c5f5c	5801f064e35181c71857a80ff18af4dbec3c5f5c
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.127-1	5.10.127-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 0 < 5.18.5-1	5.18.5-1
linux	linux_kernel	>= 4.10 < 4.14.283	4.14.283
linux	linux_kernel	>= 4.15 < 4.19.247	4.19.247
linux	linux_kernel	>= 4.20 < 5.4.198	5.4.198
linux	linux_kernel	>= 5.11 < 5.15.47	5.15.47
linux	linux_kernel	>= 5.16 < 5.17.15	5.17.15
linux	linux_kernel	>= 5.18 < 5.18.4	5.18.4
linux	linux_kernel	>= 5.5 < 5.10.122	5.10.122

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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