gb_apache_hadoop_priv_esc_vuln_may18.nasl to detect CVE-2016-6811 on specific as per the description states
Apache Hadoop versions 2.2.0 to 2.7.3 the version test compares with 2.9.3 instead of 2.7.3:
if(version_in_range(version:hadoopVer, test_version:"2.2.0", test_version2: "2.9.3"))
This causes an FP up to very recent Hadoop versions on branch 2.9.x. There is no indication that this CVE includes anything after 2.7.3 so this is very likely a typo in the version test.