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mount.ecrpytfs_private sets group owner of /etc/mtab to user's primary group

Disclosure Date: April 22, 2019 (last updated October 06, 2023)
When mount.ecrpytfs_private before version 87-0ubuntu1.2 calls setreuid() it doesn't also set the effective group id. So when it creates the new version, mtab.tmp, it's created with the group id of the user running mount.ecryptfs_private.