CVE-2021-22600 (GCVE-0-2021-22600)

Vulnerability from cvelistv5 – Published: 2022-01-26 00:00 – Updated: 2025-10-21 23:15
VLAI? CISA KEV
Title
Double Free in net/packet/af_packet.c leading to priviledge escalation
Summary
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 ?
6.6 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Kernel Kernel Affected: unspecified , < 5.4.168 (custom)
Affected: unspecified , < 5.10.88 (custom)
Affected: unspecified , < 5.15.11 (custom)
Affected: unspecified , < 5.16-rc6 (custom)
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CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fc33e64c-73de-4023-9770-04bfad6e5bf3

Vulnerability ID: CVE-2021-22600

Status: Confirmed

Status Updated: 2022-04-11 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-04-11
Asserted: 2022-04-11
Scope
Notes: KEV entry: Linux Kernel Privilege Escalation Vulnerability | Affected: Linux / Kernel | Description: 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. | Required action: Apply updates per vendor instructions. | Due date: 2022-05-02 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-22600
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-415
Feed CISA Known Exploited Vulnerabilities Catalog
Product Kernel
Due Date 2022-05-02
Date Added 2022-04-11
Vendorproject Linux
Vulnerabilityname Linux Kernel Privilege Escalation Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:27 UTC | Updated: 2026-02-02 12:27 UTC
Show details on NVD website
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}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.