CVE-2021-3493
Linux Kernel Privilege Escalation Vulnerability
IN CISA KEV
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.
- Vendor
- Linux
- Product
- Kernel
- CVSS
- No score recorded (no NVD record loaded for this entry)
- CWE
- CWE-862
- Published
- Not recorded
- NVD modified
- Not recorded
CISA KEV
- Date added
- 2022-10-20
- Due date
- 2022-11-10
- Ransomware use
- Unknown
- Required action
- Apply updates per vendor instructions.
EPSS
49.2% chance of exploitation in the next 30 days (percentile 98th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.