More information about this security flaw is available in the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=2258725 Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The file descriptor leak is in the runc binary, not the library usage of the go runc module in SingularityCE. While SingularityCE can call out to runc (if crun is not available), it does not provide the binary so we can't fix this here.