CVE-2022-49589: igmp: Fix data-races around sysctl_igmp_qrv.

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_qrv. While reading sysctl_igmp_qrv, 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. qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);

Affected products

Linux kernel: from 3.18 before 4.19.255; from 4.20 before 5.4.209; from 5.5 before 5.10.135; from 5.11 before 5.15.59; from 5.16 before 5.18.15; 5.19-rc1, 5.19-rc2, 5.19-rc3, 5.19-rc4, 5.19-rc5, 5.19-rc6 (+1) — fixed in 4.19.255, 5.10.135, 5.15.59, 5.18.15, 5.4.209

How to fix

Upgrade to a fixed version: Linux kernel 4.19.255, 5.10.135, 5.15.59, 5.18.15. Check the vendor advisory for mitigations.

References

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