Linux Kernel Privilege Escalation Vulnerability

Exploited · KEV 2022-04-11CVE-2021-22600CWE-415

Exploited since 2022-04-11. No WAF vendor names it yet.

Edge rules

0/8

Our test

No exploit yet

CVSS

6.6

EPSS

6.6% Top 6%

Posts, 14d

Published

2022-01-26

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… More

Edge coverage

Claimed by vendors

CloudflareBefore feed historyOlder than its feed AWSNo public claimNot named Microsoft AzureNo public claimNot named Google CloudBefore feed historyOlder than its feed FastlyBefore feed historyOlder than its feed F5Before feed historyOlder than its feed AkamaiNo public sourceNo public changelog OWASP CRSBefore feed historyOlder than its feed

Ask Vigil

AI · answers from this page

Ask about CVE-2021-22600: who's covered, what to patch first, how vendors compare. I cite sources and won't help with attacks.

Workers AI (Llama 3.3). Can be wrong: check the cited source.

Severity, decoded

CVSS 3.1

6.6Medium

Medium · 6.6 / 10

Exploitable with local access under specific conditions, with low privileges and user interaction, leading to low impact on confidentiality and integrity and full loss of availability, and the impact can reach components beyond the vulnerable one.

Needs local accessAny user loginNeeds a user to actHard to pull offSpreads beyond the appSerious impact

How the score is built8 metrics

Attack vectorAn attacker needs local access, or must trick a user into opening something on the machine.
Local
Attack complexityThe attack only works when conditions outside the attacker's control line up.
High
Privileges requiredThe attacker needs an ordinary user account.
Low
User interactionA user has to do something first, such as open a file or click a link.
Required
ScopeThe attack can spread beyond the vulnerable component to other parts of the system.
Changed
Confidentiality impactAn attacker can read some data, but has no control over what they get.
Low
Integrity impactAn attacker can change some data, but with limited control or limited effect.
Low
Availability impactAn attacker can take the component down completely or keep it from serving anyone.
High

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

CISA's assessmentSSVC, from the CVE record

ExploitationActive

Attackers are exploiting this in the wild.

AutomatableNo

At least one step needs hands-on work, which slows mass attacks.

Technical impactPartial

A successful attack gives limited control over the affected software or limited access to its data.

Public exploits

None found

0 Metasploit0 Exploit-DB0 Scanner template0 GitHub PoCs

No exploit in Exploit-DB or Metasploit, and no scanner template. That lowers, but doesn't remove, the chance of mass exploitation.

Timeline

2022-01-26
CVE published
CVE List
2022-04-11
Added to CISA KEV
Confirmed exploitation in the wild