By FRANK BAJAK AP Technology Writer BOSTON (AP) — A popular Chinese-made automotive GPS tracker used by individuals, government agencies and companies in 169 countries has severe software vulnerabilities, posing a potential danger to life and limb, national security and supply chains, cybersecurity researchers have found. A report by the Boston cybersecurity firm BitSight says the flaws could let attackers remotely hijack device-equipped vehicles, cutting off fuel to them and otherwise seizing control while they travel. The researchers say users should immediately disable the MV720 GPS tracker until a fix becomes available. The report was released Tuesday to coincide with…