CASCACascade Atlas

Evidence dossier

CVE-2021-22600

Double Free in net/packet/af_packet.c leading to priviledge escalation

61.4–77.9Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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

State
PUBLISHED
Published
Jan 26, 2022
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS5.92%

2026-07-18 · v2026.06.15 · percentile 92.4%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

Googleoriginal assertion
container

Double Free in net/packet/af_packet.c leading to priviledge escalation

CISA KEVoriginal assertion
observed_exploitation

Linux Kernel Privilege Escalation Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.059180000000; percentile 0.924220000000

Applicability

Cited product scope

Trace impact →
Linux KernelKernel
[{"status": "affected", "version": "unspecified", "lessThan": "5.4.168", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "5.10.88", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "5.15.11", "versionType": "custom"}, {"status": "affected", "version": "unspecified", "lessThan": "5.16-rc6", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:h:netapp:8300:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:netapp:8700:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:netapp:a400:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:netapp:c400:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:netapp:h300s:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:netapp:h410c:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:netapp:h410s:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:netapp:h500s:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:netapp:h700s:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 4.14.175; end excluding 4.14.259supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 4.19.114; end excluding 4.19.222supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 5.4.29; end excluding 5.4.168supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 5.5.14; end excluding 5.10.88supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; start including 5.11; end excluding 5.15.11supported
Unknown vendorUnknown product
cpe:2.3:o:netapp:8300_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:netapp:8700_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:netapp:a400_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:netapp:c400_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

7.0
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2
nvd@nist.govCVSS 2.0 · role PrimaryAV:L/AC:L/Au:N/C:C/I:C/A:C
6.6
cve-coordination@google.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H
6.6
GoogleCVSS 3.1 · role unknownCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.