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Security researchers at Qualys Security have discovered a Linux flaw that could be exploited to gain root privileges and overwrite any file on the filesystem on SELinux - enabled systems .
 ( discover vulnerability: have discovered,  Security researchers: discoverer, Qualys Security: discoverer, Linux flaw: vulnerability) 
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: have discovered,  Security researchers: discoverer, Qualys Security: discoverer, Linux flaw: vulnerability) 