KEV Entry

CVE-2021-3493

Known Exploited Vulnerability Entry External Catalog

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Entry Details
Confirmed Exploited

CVE-2021-3493

2022-10-20 00:00 UTC

Timestamps

2022-10-20

2022-10-20

Scope

KEVIntel entry: The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on... | Affected: Ubuntu / linux kernel | CVSS: 8.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False

References
  • {'id': 'CVE-2021-3493', 'url': 'https://www.cve.org/CVERecord?id=CVE-2021-3493'}
  • {'id': 'kevintel', 'url': 'https://kevintel.com/vuln/CVE-2021-3493'}

ea54b633-29cb-4291-802a-3a3d3631d6e3

caeb2787-0d58-4236-9039-7c86c3e566f3

2026-06-23 11:14 UTC

2026-06-23 11:14 UTC

Evidence
1
Type Source Signal Confidence Details GCVE Metadata
public_report kevintel successful_exploitation 0.70
View details 
{
  "added_date": "2022-10-20T00:00:00.000Z",
  "ahead_of_cisa_kev": null,
  "cvss_score": 8.8,
  "cvss_severity": "HIGH",
  "epss_percentile": null,
  "epss_score": null,
  "feed": "KEVIntel (kevintel.com)",
  "not_yet_in_cisa_kev": false,
  "product": "linux kernel",
  "title": "The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on...",
  "used_in_malware": "unknown",
  "vendor": "Ubuntu"
}
 -
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