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2021-04-17
Ubuntu Linux Kernel OverlayFS Local Privilege Escalation Vulnerability (CVE-2021-3493) Analysis and Mitigation Guide
[Affected Scope] Ubuntu Linux kernel versions with unprivileged user namespaces and OverlayFS mounting enabled
[Impact] A local unprivileged attacker can exploit improper file capability validation to gain full root privileges on the host
[Mitigation] Upgrade to the latest patched Ubuntu kernel and reboot, or temporarily disable unprivileged user namespaces