How severe is CVE-2021-22600?

CVE-2021-22600 has a CVSS score of 7/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-22600?

Affected package information for CVE-2021-22600 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-22600?

No fixed version has been published for CVE-2021-22600 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2021-22600 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2021-22600, including 2 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-22600?

CVE-2021-22600 has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 39th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

Is CVE-2021-22600 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2021-22600 (Linux Kernel Privilege Escalation Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-04-11. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-02. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

When was CVE-2021-22600 published, and has it been updated?

CVE-2021-22600 was published on January 26, 2022 and was last updated on March 14, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2022-04-11 — agencies required to remediate by 2022-05-02

CVE-2021-22600

HIGH

Also known asA-213464034ASB-A-213464034PUB-A-213464034

Published

Jan 26, 2022

Updated

Mar 14, 2026

Affected

0 pkgs

Patched

None yet

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk39th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A double free bug in packet_set_ring() in net/packet/af_packet.c can be …

source.android.comGoogle-sheetMar 2022

A double free bug in packet_set_ring() in net/packet/af_packet.c can be …

cisa.govCISAApr 2022

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-22600 in your stack?

O3 detects CVE-2021-22600 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works