CVE-2021-22600 (GCVE-0-2021-22600)
Vulnerability from cvelistv5 – Published: 2022-01-26 00:00 – Updated: 2025-10-21 23:15Title
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)
SSVC
Exploitation: active
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-29 20:47 UTC
CWE
- CWE-415 - Double Free
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://git.kernel.org/pub/scm/linux/kernel/git/t… | |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-list |
| https://www.debian.org/security/2022/dsa-5096 | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2023011… | |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) |
guessed |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b8064bbc-29b6-4747-8a15-a169bb511809
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 13:25 UTC
| Updated: 2026-02-06 07:53 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: eb6567f5-2071-46ae-bb33-1fef37387ce0
Exploited: Yes
Timestamps
First Seen: 2022-04-11
Asserted: 2022-04-11
Scope
Notes: KEVIntel entry: Double Free in net/packet/af_packet.c leading to priviledge escalation | Affected: Linux Kernel / Kernel | CVSS: 6.6 (MEDIUM) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Double Free in net/packet/af_packet.c leading to priviledge escalation |
| Vendor | Linux Kernel |
| Product | Kernel |
| Added Date | 2022-04-11T00:00:00.000Z |
| Cvss Score | 6.6 |
| Epss Score | None |
| Cvss Severity | MEDIUM |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 11:13 UTC
| Updated: 2026-06-23 11:13 UTC
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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