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CVE-2021-22600

Double Free in net/packet/af_packet.c leading to priviledge escalation

Published: Jan 26, 2022Updated: Oct 24, 2025 Sources: CVE List NVD BDUCWE-415
NVD MITRE
6.6CVSSMEDIUM
EPSS Score
5.9%
Top 7.7%
CISA KEV
Active Exploitation
Since Apr 11, 2022
Exploits
No Known Exploits
Remediation
Patch Available

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 Breakdown

AV:LAC:HPR:LUI:RS:CC:LI:LA:H
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-415

Affected Products

Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
UbuntuCanonical Ltd.
On-premOS
Operating Systems / linux-distro
Astra Linux Special EditionООО «РусБИТех-Астра»
On-premOS
Operating Systems / linux-distro
ОСОН ОСнова ОnyxАО «НППКТ»
On-premOS
Operating Systems / linux-distro
LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
canonical ltd.commercialGBOperating Systemsaka canonical
ооо «русбитех-астра»commercialRUOperating Systemsaka rusbitech-astra
ао «нппкт»commercialRUOperating Systems
and 13 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Apr 11, 2022
Remediation due:May 2, 2022

Required action: Apply updates per vendor instructions.

Official Patch Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22600
cve.mitre.org
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755
git.kernel.org
https://kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.259
kernel.org
and 29 more references View all →

Timeline

Published
Jan 26, 2022
Added to CISA KEV
Apr 11, 2022
Last Updated
Oct 24, 2025

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