CASCACascade Atlas

Evidence dossier

CVE-2021-0920

CVE-2021-0920

57.8–74.1Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

In unix_scm_to_skb of af_unix.c, there is a possible use after free bug due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-196926917References: Upstream kernel

State
PUBLISHED
Published
Dec 15, 2021
Updated
Oct 21, 2025
Evidence coverage
85%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS0.81%

2026-07-18 · v2026.06.15 · percentile 52.8%

Source stateNo scored conflict

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

google_androidoriginal assertion
container

In unix_scm_to_skb of af_unix.c, there is a possible use after free bug due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-196926917References: Upstream kernel

CISA KEVoriginal assertion
observed_exploitation

Android Kernel Race Condition Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.008110000000; percentile 0.528470000000

Applicability

Cited product scope

Trace impact →
n/aAndroid
[{"status": "affected", "version": "Android kernel"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:google:android:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*; end including 5.13supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:*supported

Assessments

CVSS by origin

6.4
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
6.9
nvd@nist.govCVSS 2.0 · role PrimaryAV:L/AC:M/Au:N/C:C/I:C/A:C
6.4
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
6.4
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/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.