{"id":"CVE-2018-1121","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-1121","generatedAt":"2026-10-28T20:10:38.716Z","title":"procps-ng, procps is vulnerable to a process hiding through race condition.","description":"procps-ng, procps is vulnerable to a process hiding through race condition. Since the kernel's proc_pid_readdir() returns PID entries in ascending numeric order, a process occupying a high PID can use inotify events to determine when the process list is being scanned, and fork/exec to obtain a lower PID, thus avoiding enumeration. An unprivileged attacker can hide a process from procps-ng's utilities by exploiting a race condition in reading /proc/PID entries. This vulnerability affects procps and procps-ng up to version 3.3.15, newer versions might be affected also.","published":"2018-06-13T20:29:00.000Z","lastModified":"2026-06-17T01:50:31.000Z","status":"Modified","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.0","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},"cwe":["CWE-367","CWE-362"],"affected":["procps project/procps"],"epss":{"score":0.04105,"percentile":0.90707,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2018-05-30","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":44806,"kind":"exploit","title":"Procps-ng - Multiple Vulnerabilities","url":"https://www.exploit-db.com/exploits/44806","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/linux/local/44806.txt","file":"exploits/linux/local/44806.txt","published":"2018-05-30","added":"2018-05-30","updated":"2018-05-30","author":"Qualys Corporation","type":"local","platform":"linux","port":null,"verified":false,"codes":["CVE-2018-1124","CVE-2018-1123","CVE-2018-1122","CVE-2018-1121","CVE-2018-1120"],"tags":"Local","aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"high","text":"A public exploit is published in Exploit-DB, so the technical barrier is gone even though the severity is medium and EPSS is 4.1%. Treat it as high on anything reachable from the internet."},"changes":[],"references":[{"url":"http://seclists.org/oss-sec/2018/q2/122","tags":["Exploit","Mailing List","Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"http://www.securityfocus.com/bid/104214","tags":["Third Party Advisory","VDB Entry"],"source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1121","tags":["Issue Tracking","Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://www.exploit-db.com/exploits/44806/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"secalert@redhat.com"},{"url":"https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt","tags":["Exploit","Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"http://seclists.org/oss-sec/2018/q2/122","tags":["Exploit","Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/104214","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1121","tags":["Issue Tracking","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/44806/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-1121","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}