CVE-2021-3493

Known Exploited Vulnerability Entry External Catalog

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Entry Details

CVE-2021-3493

Confirmed

Yes

2022-10-20 00:00 UTC

Timestamps

2022-10-20

2022-10-20

Scope

KEV entry: Linux Kernel Privilege Escalation Vulnerability | Affected: Linux / Kernel | Description: The overlayfs stacking file system in Linux kernel does not properly validate the application of file capabilities against user namespaces, which could lead to privilege escalation. | Required action: Apply updates per vendor instructions. | Due date: 2022-11-10 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7c03e2cda4a584cadc398e8f6641ca9988a39d52; https://nvd.nist.gov/vuln/detail/CVE-2021-3493

References
  • {'id': 'CVE-2021-3493', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-3493'}

576f2de9-0f36-4247-b1dd-51b66a575fa5

405284c2-e461-4670-8979-7fd2c9755a60

2026-02-02 13:25 UTC

2026-02-06 07:53 UTC

Evidence (1)
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-862"
  ],
  "date_added": "2022-10-20",
  "due_date": "2022-11-10",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Kernel",
  "vendorProject": "Linux",
  "vulnerabilityName": "Linux Kernel Privilege Escalation Vulnerability"
}
 -
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