Is CVE-2021-22600 in the CISA KEV catalog?

Yes. CVE-2021-22600 is on the CISA Known Exploited Vulnerabilities list, added 2022-04-11.

What is the CVSS severity of CVE-2021-22600?

CVE-2021-22600 has a CVSS v3 base score of 6.6 (MEDIUM).

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

CVE-2021-22600 has an EPSS score of 5.92% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22600?

Upgrade linux on debian 11 to 5.10.92-1 or later. Fixes are available for 111 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22600

MEDIUMCISA KEVEPSS 92th pctl

6.6

CVSS v3

NVD

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

CWE-415

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.92-1CVE-2021-22600

Fixed in:5.15.15-1CVE-2021-22600

linuxUbuntu

Fixed in:4.15.0-169.177USN-5298-1

Fixed in:5.4.0-100.113USN-5294-1

linux-awsUbuntu

Fixed in:4.15.0-1121.129USN-5298-1

Fixed in:5.4.0-1066.69USN-5294-2

linux-aws-5.13Ubuntu

Fixed in:5.13.0-1014.15~20.04.1USN-5295-2

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1066.69~18.04.1USN-5294-2

linux-aws-hweUbuntu

Fixed in:4.15.0-1120.128~16.04.1USN-5298-1

linux-azureUbuntu

Fixed in:4.15.0-1131.144~14.04.1USN-5298-1

Fixed in:4.15.0-1131.144~16.04.1USN-5298-1

Fixed in:5.4.0-1070.73USN-5294-2

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1131.144USN-5298-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1070.73~18.04.1USN-5294-2

linux-azure-fdeUbuntu

Fixed in:5.4.0-1070.73+cvm1.1USN-5294-2

linux-bluefieldUbuntu

Fixed in:5.4.0-1028.31USN-5294-2

linux-dell300xUbuntu

Fixed in:4.15.0-1035.40USN-5298-1

linux-gcpUbuntu

Fixed in:4.15.0-1116.130~16.04.1USN-5298-1

Fixed in:5.4.0-1065.69USN-5294-2

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1116.130USN-5298-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1065.69~18.04.1USN-5294-2

linux-gkeUbuntu

Fixed in:5.4.0-1061.64USN-5266-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1061.64~18.04.1USN-5266-1

linux-gkeopUbuntu

Fixed in:5.4.0-1034.35USN-5294-2

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1034.35~18.04.1USN-5294-2

linux-hweUbuntu

Fixed in:4.15.0-169.177~16.04.1USN-5298-1

linux-hwe-5.13Ubuntu

Fixed in:5.13.0-30.33~20.04.1USN-5295-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-100.113~18.04.1USN-5294-2

linux-ibmUbuntu

Fixed in:5.4.0-1015.16USN-5294-2

linux-ibm-5.4Ubuntu

Fixed in:5.4.0-1015.16~18.04.1USN-5294-2

linux-image-4.15.0-1035-dell300xUbuntu

Fixed in:4.15.0-1035.40USN-5298-1

linux-image-4.15.0-1087-oracleUbuntu

Fixed in:4.15.0-1087.95~16.04.1USN-5298-1

Fixed in:4.15.0-1087.95USN-5298-1

linux-image-4.15.0-1103-raspi2Ubuntu

Fixed in:4.15.0-1103.110USN-5298-1

linux-image-4.15.0-1107-kvmUbuntu

Fixed in:4.15.0-1107.109USN-5298-1

linux-image-4.15.0-1116-gcpUbuntu

Fixed in:4.15.0-1116.130~16.04.1USN-5298-1

Fixed in:4.15.0-1116.130USN-5298-1

linux-image-4.15.0-1120-snapdragonUbuntu

Fixed in:4.15.0-1120.129USN-5298-1

linux-image-4.15.0-1131-azureUbuntu

Fixed in:4.15.0-1131.144~14.04.1USN-5298-1

Fixed in:4.15.0-1131.144~16.04.1USN-5298-1

Fixed in:4.15.0-1131.144USN-5298-1

linux-image-4.15.0-169-genericUbuntu

Fixed in:4.15.0-169.177~16.04.1USN-5298-1

Fixed in:4.15.0-169.177USN-5298-1

linux-image-4.15.0-169-generic-lpaeUbuntu

Fixed in:4.15.0-169.177USN-5298-1

linux-image-4.15.0-169-lowlatencyUbuntu

Fixed in:4.15.0-169.177~16.04.1USN-5298-1

Fixed in:4.15.0-169.177USN-5298-1

linux-image-5.13.0-1014-awsUbuntu

Fixed in:5.13.0-1014.15~20.04.1USN-5295-2

linux-image-5.13.0-1018-oracleUbuntu

Fixed in:5.13.0-1018.22~20.04.1USN-5295-2

linux-image-5.13.0-30-genericUbuntu

Fixed in:5.13.0-30.33~20.04.1USN-5295-1

linux-image-5.13.0-30-generic-64kUbuntu

Fixed in:5.13.0-30.33~20.04.1USN-5295-1

linux-image-5.13.0-30-generic-lpaeUbuntu

Fixed in:5.13.0-30.33~20.04.1USN-5295-1

linux-image-5.13.0-30-lowlatencyUbuntu

Fixed in:5.13.0-30.33~20.04.1USN-5295-1

linux-image-5.14.0-1022-oemUbuntu

Fixed in:5.14.0-1022.24USN-5278-1

linux-image-5.4.0-100-genericUbuntu

Fixed in:5.4.0-100.113~18.04.1USN-5294-2

Fixed in:5.4.0-100.113USN-5294-1

linux-image-5.4.0-100-generic-lpaeUbuntu

Fixed in:5.4.0-100.113~18.04.1USN-5294-2

Fixed in:5.4.0-100.113USN-5294-1

linux-image-5.4.0-100-lowlatencyUbuntu

Fixed in:5.4.0-100.113~18.04.1USN-5294-2

Fixed in:5.4.0-100.113USN-5294-1

linux-image-5.4.0-1015-ibmUbuntu

Fixed in:5.4.0-1015.16~18.04.1USN-5294-2

Fixed in:5.4.0-1015.16USN-5294-2

linux-image-5.4.0-1028-bluefieldUbuntu

Fixed in:5.4.0-1028.31USN-5294-2

linux-image-5.4.0-1034-gkeopUbuntu

Fixed in:5.4.0-1034.35~18.04.1USN-5294-2

Fixed in:5.4.0-1034.35USN-5294-2

linux-image-5.4.0-1053-raspiUbuntu

Fixed in:5.4.0-1053.60~18.04.1USN-5294-2

Fixed in:5.4.0-1053.60USN-5294-2

linux-image-5.4.0-1056-kvmUbuntu

Fixed in:5.4.0-1056.58USN-5294-2

linux-image-5.4.0-1061-gkeUbuntu

Fixed in:5.4.0-1061.64~18.04.1USN-5266-1

Fixed in:5.4.0-1061.64USN-5266-1

linux-image-5.4.0-1064-oracleUbuntu

Fixed in:5.4.0-1064.68~18.04.1USN-5294-2

Fixed in:5.4.0-1064.68USN-5294-2

linux-image-5.4.0-1065-gcpUbuntu

Fixed in:5.4.0-1065.69~18.04.1USN-5294-2

Fixed in:5.4.0-1065.69USN-5294-2

linux-image-5.4.0-1066-awsUbuntu

Fixed in:5.4.0-1066.69USN-5294-2

linux-image-5.4.0-1070-azureUbuntu

Fixed in:5.4.0-1070.73~18.04.1USN-5294-2

Fixed in:5.4.0-1070.73USN-5294-2

linux-image-5.4.0-1070-azure-fdeUbuntu

Fixed in:5.4.0-1070.73+cvm1.1USN-5294-2

linux-image-awsUbuntu

Fixed in:5.4.0.1066.48USN-5294-2

Fixed in:5.13.0.1014.15~20.04.7USN-5295-2

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1120.111USN-5298-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1121.124USN-5298-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1066.68USN-5294-2

linux-image-azureUbuntu

Fixed in:4.15.0.1131.104USN-5298-1

Fixed in:4.15.0.1131.122USN-5298-1

Fixed in:5.4.0.1070.49USN-5294-2

linux-image-azure-fdeUbuntu

Fixed in:5.4.0.1070.73+cvm1.16USN-5294-2

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1131.104USN-5298-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1070.68USN-5294-2

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1028.29USN-5294-2

linux-image-dell300xUbuntu

Fixed in:4.15.0.1035.37USN-5298-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1116.117USN-5298-1

Fixed in:5.4.0.1065.50USN-5294-2

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1116.135USN-5298-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1065.75USN-5294-2

linux-image-genericUbuntu

Fixed in:4.15.0.169.158USN-5298-1

Fixed in:5.4.0.100.104USN-5294-1

linux-image-generic-64k-hwe-20.04Ubuntu

Fixed in:5.13.0.30.33~20.04.17USN-5295-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.169.161USN-5298-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.100.113~18.04.87USN-5294-2

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.13.0.30.33~20.04.17USN-5295-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.169.158USN-5298-1

Fixed in:5.4.0.100.104USN-5294-1

linux-image-generic-lpae-hwe-18.04Ubuntu

Fixed in:5.4.0.100.113~18.04.87USN-5294-2

linux-image-generic-lpae-hwe-20.04Ubuntu

Fixed in:5.13.0.30.33~20.04.17USN-5295-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1116.117USN-5298-1

Fixed in:5.4.0.1061.71USN-5266-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1061.64~18.04.25USN-5266-1

Fixed in:5.4.0.1061.71USN-5266-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1034.37USN-5294-2

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1034.35~18.04.34USN-5294-2

Fixed in:5.4.0.1034.37USN-5294-2

linux-image-ibmUbuntu

Fixed in:5.4.0.1015.32USN-5294-2

Fixed in:5.4.0.1015.16USN-5294-2

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1015.16USN-5294-2

linux-image-kvmUbuntu

Fixed in:4.15.0.1107.103USN-5298-1

Fixed in:5.4.0.1056.55USN-5294-2

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.169.158USN-5298-1

Fixed in:5.4.0.100.104USN-5294-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.169.161USN-5298-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.100.113~18.04.87USN-5294-2

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.13.0.30.33~20.04.17USN-5295-1

linux-image-oemUbuntu

Fixed in:4.15.0.169.161USN-5298-1

Fixed in:5.4.0.100.113~18.04.87USN-5294-2

Fixed in:5.4.0.100.104USN-5294-1

linux-image-oem-20.04dUbuntu

Fixed in:5.14.0.1022.19USN-5278-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.100.113~18.04.87USN-5294-2

Fixed in:5.4.0.100.104USN-5294-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1087.75USN-5298-1

Fixed in:5.4.0.1064.68~18.04.43USN-5294-2

Fixed in:5.13.0.1018.22~20.04.1USN-5295-2

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1087.97USN-5298-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1064.64USN-5294-2

linux-image-raspiUbuntu

Fixed in:5.4.0.1053.87USN-5294-2

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1053.55USN-5294-2

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1103.101USN-5298-1

Fixed in:5.4.0.1053.87USN-5294-2

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1120.123USN-5298-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.100.113~18.04.87USN-5294-2

linux-image-virtualUbuntu

Fixed in:4.15.0.169.158USN-5298-1

Fixed in:5.4.0.100.104USN-5294-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.169.161USN-5298-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.100.113~18.04.87USN-5294-2

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.13.0.30.33~20.04.17USN-5295-1

linux-kvmUbuntu

Fixed in:4.15.0-1107.109USN-5298-1

Fixed in:5.4.0-1056.58USN-5294-2

linux-oem-5.14Ubuntu

Fixed in:5.14.0-1022.24USN-5278-1

linux-oracleUbuntu

Fixed in:4.15.0-1087.95~16.04.1USN-5298-1

Fixed in:4.15.0-1087.95USN-5298-1

Fixed in:5.4.0-1064.68USN-5294-2

linux-oracle-5.13Ubuntu

Fixed in:5.13.0-1018.22~20.04.1USN-5295-2

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1064.68~18.04.1USN-5294-2

linux-raspiUbuntu

Fixed in:5.4.0-1053.60USN-5294-2

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1053.60~18.04.1USN-5294-2

linux-raspi2Ubuntu

Fixed in:4.15.0-1103.110USN-5298-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1120.129USN-5298-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityHigh

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

Exploit Intelligence

5.92%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Linux Kernel Privilege Escalation Vulnerability

Linux Kernel contains a flaw in the packet socket (AF_PACKET) implementation which could lead to incorrectly freeing memory. A local user could exploit this for denial-of-service (DoS) or possibly for privilege escalation.

Apply updates per vendor instructions.

Remediation due: 2022-05-02

References

Patch1

git.kernel.org

Third-Party Advisory3

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-415 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-25136	Medium	6.5	90%	-	Fix
CVE-2018-0101	Critical	10.0	87%	-	Fix
CVE-2003-0545	Critical	9.8	85%	-	Fix
CVE-2019-3829	Medium	5.3	59%	-	Fix
CVE-2026-33824	Critical	9.8	56%	-	Fix
CVE-2021-3407	Medium	5.5	50%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-24.