In the Linux kernel, the following vulnerability has been resolved: igmp: Fix data-races around sysctligmpqrv. While reading sysctligmpqrv, it can be changed concurrently. Thus, we need to add READONCE() 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 ?: READONCE(net->ipv4.sysctligmpqrv);