[keyanp]

In the case of a multi-user machine, e.g. in a library, you expect there to be low privilege users with filesystem access. This bug introduces a way for them to do privilege escalation and potentially run code as root, which you did not intend.

Generally, you still want these additional protections even if you don't expect others to have access to a machine. Can't say if one or the other is a bigger problem. I think they are all components of having a secure system.