CVE-2021-3493: Linux Kernel Privilege Escalation Vulnerability
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 |
| Date added to KEV | 2022-10-20 |
| Due date (BOD 22-01) | 2022-11-10 |
| Known ransomware campaign use | Unknown |
| CWE | CWE-862 |
| Required action | Apply updates per vendor instructions. |
What to do
- Identify every instance of Linux Kernel in your environment (asset inventory, EDR, vulnerability scanner).
- Apply CISA's required action: Apply updates per vendor instructions.
- Federal civilian agencies must act by 2022-11-10 under BOD 22-01; other organizations can use the same date as a target.
- Check the vendor advisory and NVD entry linked below for affected versions, then record the fix in your change log.
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