(Image credit: Future) If you've ever felt anxious about the security of your machine while you wait for a solution to some vulnerability, a proposed change to the Linux kernel may interest you. Pitched by Nvidia staff Sasha Levin, it's effectively a killswitch that could shut down some functions while waiting for a more official solution. As spotted by The Information , Levin writes, "Killswitch lets a privileged operator make a chosen kernel function return a fixed value without executing its body, as a temporary mitigation for a security bug while a real fix is being prepared" Levine continues, "For most users, the cost of 'this socket family stops working for the day' is much smaller than the cost of running a known vulnerable kernel until the fix lands." This killswitch was suggested just a week after researchers caught a root exploit called " Copyfail ". Effectively, this exploit can escalate user privileges by replacing code, and that user can exploit escalated user privileges to attack machines.…