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He said vulnerable versions of the Motorola Android bootloader allow for a kernel command - line injection attack .
 ( discover vulnerability: said,  He: discoverer, Motorola Android bootloader: vulnerable system, allow for a kernel command - line injection attack: capabilities, vulnerable versions: vulnerable system version) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( discover vulnerability: said,  He: discoverer, Motorola Android bootloader: vulnerable system, allow for a kernel command - line injection attack: capabilities, vulnerable versions: vulnerable system version) 