What’s Vulnerable › Vulnerabilities

CVE-2022-49590: igmp: Fix data-races around sysctl_igmp_llm_reports.

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-362

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))

Affected products

• Linux kernel: from 4.3 before 4.9.325; from 4.10 before 4.14.290; from 4.15 before 4.19.254; from 4.20 before 5.4.208; from 5.5 before 5.10.134; from 5.11 before 5.15.58 — fixed in 4.14.290, 4.19.254, 4.9.325, 5.10.134, 5.15.58, 5.18.15

How to fix

Upgrade to a fixed version: Linux kernel 4.14.290, 4.19.254, 4.9.325, 5.10.134. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1656ecaddf90e2a070ec2d2404cdae3edf80faca
• https://git.kernel.org/stable/c/260446eb8e5541402b271343a4516f2b33dec1e4
• https://git.kernel.org/stable/c/46307adceb67bdf2ec38408dd9cebc378a6b5c46
• https://git.kernel.org/stable/c/473aad9ad57ff760005377e6f45a2ad4210e08ce
• 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/f6da2267e71106474fbc0943dc24928b9cb79119

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