CVE-2022-49590 Information

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))

Reference

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