In the Linux kernel, the following vulnerability has been resolved: netfilter: nfconncount: update lastgc only when GC has been performed Currently lastgc is being updated everytime a new connection is tracked, that means that it is updated even if a GC wasn't performed. With a sufficiently high packet rate, it is possible to always bypass the GC, causing the list to grow infinitely. Update the lastgc value only when a GC has been actually performed.