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While CVE-2010-4347 covers the unprivileged to fully privileged escalation
issue, this interface still allows an unprivileged root user to gain
back all their capabilities.
Having a system with acpi and debugfs built into the kernel allows
a uid=0 user (without capabilities, e.g. in containers) to write to
arbitrary kernel memory, likely resulting in escalated capability
privileges, or unlocking an otherwise modules-disabled kernel by
changing /proc/sys/kernel/modules_disabled back to 0.
-- Kees Cook Ubuntu Security Team