CVE-2021-22600Double Free in net/packet/af_packet.c leading to priviledge escalation

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

7.0 HIGHEPSS 6.58%⚡ Known Exploited (CISA KEV)NVD: Analyzed

Last updated: 2026-06-17 03:37 UTC

OverviewCVSS details

7.0HIGHCVSS 3.1

Score source: NVD
NVD status: Analyzed
Published: Jan 26, 2022
Assigner: Google

Affected

Kernel (Linux Kernel)

Versions: before 5.4.168 · before 5.10.88
Fixed in: 5.4.168, 5.10.88, 5.15.11

All affected versions →

Exploitation

Public exploit: None listed
CISA KEV: Listed · Apr 11, 2022
KEV due date: May 2, 2022
Ransomware use: Unknown
SSVC: Exploitation active · Automatable no · Impact partial

EPSS · FIRST, scored Nov 7

6.58%chance of exploitation in 30 days

Higher than 93.87% of CVEs

CVSS 3.1 · NVD

7.0High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack vector: Local
Attack complexity: High
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

CVSS 3.1 · Google (CNA)

6.6Medium

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

Attack vector: Local
Attack complexity: High
Privileges required: Low
User interaction: Required
Scope: Changed
Confidentiality impact: Low
Integrity impact: Low
Availability impact: High

CVSS 2.0 · NVD

7.2High

AV:L/AC:L/Au:N/C:C/I:C/A:C

Attack vector: Local
Attack complexity: Low
Authentication: None
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
7.0	HIGH	3.1NVD	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.6	MEDIUM	3.1Google (CNA)	CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H
7.2	HIGH	2.0NVD	AV:L/AC:L/Au:N/C:C/I:C/A:C

CISA required action

⚡ Known exploited · remediation due May 2, 2022

Apply updates per vendor instructions.

Details

CVE ID: CVE-2021-22600
Status: Analyzed
Assigner (CNA): Google
Published: Jan 26, 2022
Last modified: 2026-06-17 03:37 UTC
Weaknesses: CWE-415 · Double Free

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 13:34 UTC.