CVE-2021-3493

Vulnerability details

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.

Added to CISA KEV: 2022-10-20

Ransomware campaign use: Unknown

CISA due date: 2022-11-10

Defensive guidance from CISA

Apply updates per vendor instructions.

This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.