What’s Vulnerable › Vulnerabilities

CVE-2018-1121

• Severity: medium (CVSS 5.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-06-13 · updated 2026-06-17
• Weakness: CWE-367

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.

Affected products

• [UNKNOWN] procps-ng, procps: through 3.3.15

References

• http://seclists.org/oss-sec/2018/q2/122
• http://www.securityfocus.com/bid/104214
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1121
• https://www.exploit-db.com/exploits/44806/
• https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt
• http://seclists.org/oss-sec/2018/q2/122
• http://www.securityfocus.com/bid/104214
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1121
• https://www.exploit-db.com/exploits/44806/
• https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt

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