# CVE-2021-22600: Linux Kernel Privilege Escalation Vulnerability

Source: https://junglewise.ai/threats/cve-2021-22600-linux-kernel-privilege-escalation-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-04-11. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2021-22600 · Severity: critical · CVSS 7 · Exploited in the wild · Published 2022-04-11

A double-free vulnerability exists in the packet_set_ring() function within net/packet/af_packet.c of the Linux Kernel. A local attacker can exploit this flaw via crafted syscalls to achieve privilege escalation or cause a denial-of-service (DoS) condition.

Technologies: [Linux Kernel](https://junglewise.ai/threats/technologies/kernel). Vendors: [Linux](https://junglewise.ai/threats/vendors/linux).

## Quick answers

**Is CVE-2021-22600 exploited in the wild?** Yes. CVE-2021-22600 is known to be exploited in the wild, first recorded on 11 April 2022. Treat it as urgent.

**How severe is CVE-2021-22600?** Critical severity, with a CVSS score of 7, published 11 April 2022.

**Which products and versions are affected?** Linux Linux Kernel up to (excluding) 5.4.168, 5.10.88, 5.15.11, 5.16.x; NetApp ONTAP Select Deploy.

**Is there a fix for CVE-2021-22600?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2021-22600 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2021-22600?** Check whether you run Linux Kernel. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Linux Linux Kernel up to (excluding) 5.4.168, 5.10.88, 5.15.11, 5.16.x
- NetApp ONTAP Select Deploy

## Timeline

- 2022-04-11: kev added: Added to CISA's Known Exploited Vulnerabilities Catalog
- 2022-04-11: disclosed

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