Firejail does not restrict access to --tmpfs, which allows local users to gain privileges, as demonstrated by mounting over /etc.
{ "availability": "No subscription required", "binaries": [ { "binary_name": "firejail", "binary_version": "0.9.38-1" }, { "binary_name": "firejail-dbgsym", "binary_version": "0.9.38-1" } ] }
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-10117.json"