Linux Kernel Privilege Escalation Vulnerability

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

• cpe debian/debian linux9.0
• cpe linux/linux kernelversion unspecified
• cpe netapp/8300 firmwareversion unspecified
• cpe netapp/8700 firmwareversion unspecified
• cpe netapp/a400 firmwareversion unspecified
• cpe netapp/c400 firmwareversion unspecified
• cpe netapp/h300s firmwareversion unspecified
• cpe netapp/h410c firmwareversion unspecified
• cpe netapp/h500s firmwareversion unspecified
• vendor Linux Kernelversion unspecified

How to fix CVE-2021-22600

• Recommended remediation

  Apply updates per vendor instructions. CISA due date May 2, 2022.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · git.kernel.org

Timeline

Detection, updates, and resolution for this record.

1. Jan 26, 2022 · Catalog

   Detected

   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

2. Apr 11, 2022 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. May 2, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   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

Sources

• CISA KEVConfirmed exploitationCVE-2021-22600

  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.

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-22600

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-22600

  30-day exploitation probability 6.6%

  first.org
• NIST NVDVulnerability recordCVE-2021-22600

  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

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2021-22600

  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.

  vulncheck.com

References

• VulnCheck exploitation evidence · docs.google.com
• Mailing List · git.kernel.org
• Mailing List · lists.debian.org
• CISA note · nvd.nist.gov
• VulnCheck exploitation evidence · raw.githubusercontent.com
• Third Party Advisory · security.netapp.com
• VulnCheck exploitation evidence · storage.googleapis.com
• VulnCheck exploitation evidence · cisa.gov
• Third Party Advisory · debian.org

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.