CVE-2021-22600

Name: CVE-2021-22600
Creator: NVD / NIST
Published: 2022-01-26T14:15:08.123+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7/10Actively ExploitedEPSS 5.92%

Last modified Jun 17, 2026

CVE-2021-22600 is a high-severity vulnerability rated 7/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 5.92% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

7/10

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

EPSS Probability

5.92%

92.3th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 2, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Netapp	8300 Firmware	All versions
Netapp	8700 Firmware	All versions
Netapp	A400 Firmware	All versions
Netapp	C400 Firmware	All versions
Linux	Linux Kernel	>= 4.14.175, < 4.14.259
Linux	Linux Kernel	>= 4.19.114, < 4.19.222
Linux	Linux Kernel	>= 5.4.29, < 5.4.168
Linux	Linux Kernel	>= 5.5.14, < 5.10.88
Linux	Linux Kernel	>= 5.11, < 5.15.11
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Netapp	H410c Firmware	All versions
Netapp	H300s Firmware	All versions
Netapp	H500s Firmware	All versions
Netapp	H700s Firmware	All versions
Netapp	H410s Firmware	All versions

References

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755Mailing List, Patch
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20230110-0002/Third Party Advisory
https://www.debian.org/security/2022/dsa-5096Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755Mailing List, Patch
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20230110-0002/Third Party Advisory
https://www.debian.org/security/2022/dsa-5096Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22600US Government Resource

Timeline

Published: Jan 26, 2022
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-22600?

How severe is CVE-2021-22600?

CVE-2021-22600 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 5.92% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-22600?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22600?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST