Immense stress has infected the brains of #CISOs (chief information security officers) with malware, and they're looking to call it quits. The typical tenure of a CISO lasts just 18 to 26 months, compared to nearly five years for other C-suite roles, according to a report from Cybersecurity Ventures @Cybersecurity in partnership with @Sophos. tech.yahoo.com/cybersecurity…