CVE-2022-49339

net: ipv6: unexport __init-annotated seg6_hmac_init()

MEDIUM

5.5

CVSS Score

Published: February 26, 2025 at 02:10 AM UTC

Updated: June 17, 2026 at 05:17 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.10 ≤ v < 4.14.2834.10 ≤ v < 4.19.2474.10 ≤ v < 5.10.1224.10 ≤ v < 5.15.474.10 ≤ v < 5.17.154.10 ≤ v < 5.18.44.10 ≤ v < 5.194.10 ≤ v < 5.4.1984.15 ≤ v < 4.19.2474.20 ≤ v < 5.4.1985.11 ≤ v < 5.15.475.16 ≤ v < 5.17.155.18 ≤ v < 5.18.45.5 ≤ v < 5.10.1224.10 5.19 rc1bf355b8d2c30a289232042cacc1cfaea4923936c

Vendor states this is fixed in 1084716f76c8045eadf92a9d9a62641f3c8d8c90 (fixed)

Vendor states this is fixed in 317260b3eb6384a05a8af212308fa50f3b2e8290 (fixed)

Vendor states this is fixed in 3e6de5037148c5a93a436b1e8d2edad3dac11755 (fixed)

Vendor states this is fixed in 5801f064e35181c71857a80ff18af4dbec3c5f5c (fixed)

Vendor states this is fixed in 5d9c1b081ad28c852a97e10dd75412546497694a (fixed)

Vendor states this is fixed in 64aef8efe96c1616142c4476a05731306fc4494e (fixed)

Vendor states this is fixed in 9ba4416b831eeb4d185e88e73488d1d21288e63a (fixed)

Vendor states this is fixed in ab8b2c2de273ec1d698a18e399896a6febb5cda0 (fixed)

Vendor states this is fixed in 4.10 (unaffected)

Vendor states this is fixed in 4.14.283 (unaffected)

Vendor states this is fixed in 4.19.247 (unaffected)

Vendor states this is fixed in 5.10.122 (unaffected)