I am using the yum module to lock the release version for a RHEL 7.6 machine to 7.7 version. However the yum --releasever option does not set the release version to 7.7. I am using Ansible 2.7.10 version.
Here is the discussion regarding the issue: 
https://access.redhat.com/discussions/4774501

ISSUE TYPE
Bug Report

COMPONENT NAME
yum --releasever

ANSIBLE VERSION
2.7.10 

STEPS TO REPRODUCE
name: installing updated packages
yum:
name: '*'
state: latest
releasever: '7.7'

ACTUAL RESULTS
Play runs successfully however it does not update the release version of the server
pkgs = []
        downgrade_pkgs = []
        res = {}
        res['results'] = []
        res['msg'] = ''
        res['rc'] = 0
        res['changed'] = False
        for spec in items:
            pkg = None
            downgrade_candidate = False
            
            if spec.endswith('.rpm') or '://' in spec:
                if '://' not in spec and not os.path.exists(spec):
                    res['msg'] += "No RPM file matching '%s' found on system" % spec
                    res['results'].append("No RPM file matching '%s' found on system" % spec)
                    res['rc'] = 127  
                    self.module.fail_json(**res)
                if '://' in spec:
                    with self.set_env_proxy():
                        package = fetch_file(self.module, spec)
                        if not package.endswith('.rpm'):
                            
                            
                            new_package_path = '%s.rpm' % package
                            os.rename(package, new_package_path)