In the Linux kernel, the following vulnerability has been resolved: ipv6/sit: use DEVSTATSINC() to avoid data-races syzbot/KCSAN reported that multiple cpus are updating dev->stats.txerror concurrently. This is because sit tunnels are NETIFFLLTX, meaning their ndostart_xmit() is not protected by a spinlock. While original KCSAN report was about tx path, rx path has the same issue.