CVE-2021-22600

MEDIUM6.6

CISA KEV

Published 2022-01-26 · Updated 2026-06-17 · Source cve-coordination@google.com

Summary

CVE-2021-22600 is a medium-severity (CVSS 6.6) vulnerability in Linux Kernel. CISA added it to the Known Exploited Vulnerabilities catalog on April 11, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 2, 2022. CISA does not currently list it as used in ransomware campaigns. Linux has 32 vulnerabilities in the KEV catalog, 2 of them linked to ransomware.

All 32 known-exploited Linux vulnerabilities →

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

CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H

CWE-415CWE-415

CISA Known-Exploited Vulnerability

Product: Linux — Kernel

Name: Linux Kernel Privilege Escalation Vulnerability

Date added: 2022-04-11 · Due: 2022-05-02

Required action: Apply updates per vendor instructions.

References

View on NVD

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Kernel — Linux Kernel Out-of-Bounds Write Vulnerability
added 2026-08-26

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