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CVE-2021-4115

5.5 · MEDIUM

There is a flaw in polkit which can allow an unprivileged user to cause polkit to crash, due to process file descriptor exhaustion.

Published Feb 21, 2022CWE-400EPSS 0.53%

Overview

CVE-2021-4115 is a medium-severity vulnerability. It was published on February 21, 2022 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

There is a flaw in polkit which can allow an unprivileged user to cause polkit to crash, due to process file descriptor exhaustion. The highest threat from this vulnerability is to availability. NOTE: Polkit process outage duration is tied to the failing process being reaped and a new one being spawned

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/172849/polkit-File-Descriptor-Exhaustion.htmlRefaccess.redhat.com/security/cve/cve-2021-4115Refgitlab.com/redhat/centos-stream/rpms/polkit/-/merge_requests/6/diffs?commit_id=bf900df04dc390d389e59aa10942b0f2b15c531eRefgitlab.freedesktop.org/polkit/polkit/-/issues/141Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VGKWCBS6IDZYYDYM2WIWJM5BL7QQTWPF/Refwww.oracle.com/security-alerts/cpujul2022.htmlRefpacketstormsecurity.com/files/172849/polkit-File-Descriptor-Exhaustion.htmlRefaccess.redhat.com/security/cve/cve-2021-4115Refgitlab.com/redhat/centos-stream/rpms/polkit/-/merge_requests/6/diffs?commit_id=bf900df04dc390d389e59aa10942b0f2b15c531eRefgitlab.freedesktop.org/polkit/polkit/-/issues/141

How CyberStrike helps

Frequently asked questions

What is CVE-2021-4115?

CVE-2021-4115 is a medium-severity vulnerability. It was published on February 21, 2022 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-4115?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-4115?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-4115?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-4115 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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