CVE-2021-22600
MEDIUMCISA KEVEPSS 93th pctlDescription
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
How to fix
This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H
Exploit Intelligence
High risk: more likely to be exploited than 93% of all known CVEs.
Linux Kernel Privilege Escalation Vulnerability
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.
Apply updates per vendor instructions.
Remediation due: 2022-05-02
References
Related Vulnerabilities
Other CWE-415 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-25136 | Medium | 6.5 | 90% | - | Fix |
| CVE-2003-0545 | Critical | 9.8 | 87% | - | Fix |
| CVE-2018-0101 | Critical | 10.0 | 73% | - | Fix |
| CVE-2026-33824 | Critical | 9.8 | 73% | KEV | Fix |
| CVE-2019-3829 | Medium | 5.3 | 58% | - | Fix |
| CVE-2021-3407 | Medium | 5.5 | 50% | - | Fix |
Common questions
How do I fix CVE-2021-22600?
Published advisories record a fix for 111 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2021-22600 being actively exploited?
Yes. CVE-2021-22600 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2022-05-02. Treat it as a priority whatever its CVSS score says.
How severe is CVE-2021-22600?
CVE-2021-22600 has a CVSS v3 base score of 6.6, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2021-22600 affect?
Published advisories record a fix for linux (Debian), linux (Ubuntu), linux-aws (Ubuntu), linux-aws-5.13 (Ubuntu), and 107 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-24.