How severe is CVE-2021-22600?

CVE-2021-22600 has a CVSS 3.1 base score of 6.6 (MEDIUM). EPSS estimates a 6.6% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2021-22600: Double Free in net/packet/af

CISA Known Exploited Vulnerabilities

Linux Kernel Privilege Escalation Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2022-04-11

Remediation due

2022-05-02

Required action
Apply updates per vendor instructions.

CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2021-22600

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

Severity

CVSS 3.1 · CNA6.6 MEDIUM

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

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impactpartial

Affected Products

Vendor	Product	Affected versions
Linux Kernel	Kernel	unspecified to <5.4.168 unspecified to <5.10.88 unspecified to <5.15.11 unspecified to <5.16-rc6

References

4 Links

Vendor advisories

DSA-5096

Mailing lists

[debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security update

Other references

Record Details

Published

2022-01-26

Last updated

2025-10-21

Assigner (CNA)

Google

Credited to

Related Tool Categories

Tool categories that test for or protect against this vulnerability class.

CWE-415 · Double Free

Fuzzing Binary Exploitation

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.