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CVE-2021-22600

6.6 · MEDIUMActively Exploited

A double free bug in packet_set_ring() in net/packet/af_packet.c can be exploited by a local user through crafted syscalls to escalate privileges or deny service.

Published Jan 26, 2022CWE-415EPSS 6.59%

Overview

CVE-2021-22600 is a medium-severity vulnerability. It was published on January 26, 2022 and has a CVSS 3.1 base score of 6.6 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 6.6, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A double free bug in packet_set_ring() in net/packet/af_packet.c can be exploited by a local user through crafted syscalls to escalate privileges or deny service. We recommend upgrading kernel past the effected versions or rebuilding past ec6af094ea28f0f2dda1a6a33b14cd57e36a9755

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

Refgit.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755Reflists.debian.org/debian-lts-announce/2022/03/msg00012.htmlRefsecurity.netapp.com/advisory/ntap-20230110-0002/Refwww.debian.org/security/2022/dsa-5096Refgit.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755Reflists.debian.org/debian-lts-announce/2022/03/msg00012.htmlRefsecurity.netapp.com/advisory/ntap-20230110-0002/Refwww.debian.org/security/2022/dsa-5096CISAwww.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22600

How CyberStrike helps

Frequently asked questions

What is CVE-2021-22600?

CVE-2021-22600 is a medium-severity vulnerability. It was published on January 26, 2022 and has a CVSS 3.1 base score of 6.6 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2021-22600?

This vulnerability has a CVSS 3.1 base score of 6.6, 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-2021-22600?

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-2021-22600?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-22600 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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