# CVE-2021-22600

## Summary

- **CVE ID:** CVE-2021-22600
- **Severity:** MEDIUM
- **CVSS Score:** 6.6 (CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H)
- **CWE:** CWE-415
- **Published:** Jan 26, 2022
- **Last Modified:** Mar 13, 2026

## 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

## Affected Products

- Linux Kernel — Kernel (unspecified)

## References

- [CNA](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755)
- [CNA](https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html)
- [CNA](https://www.debian.org/security/2022/dsa-5096)
- [CNA](https://security.netapp.com/advisory/ntap-20230110-0002/)
- [CISA-ADP](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22600)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 32.6

## Known Exploited Vulnerabilities (KEV)

- **Date Added:** Apr 11, 2022
- **Due Date:** May 2, 2022

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._