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
self.module.fail_json(**res)
                
                
                conflicts = self.transaction_exists(pkglist)
                if conflicts:
                    res['msg'] += "The following packages have pending transactions: %s" % ", ".join(conflicts)
                    res['rc'] = 125  
                    self.module.fail_json(**res)
                
                
                found = False
                for this in pkglist:
                    if self.is_installed(repoq, this, is_pkg=True):
                        found = True
                        res['results'].append('%s providing %s is already installed' % (this, spec))
                        break
                
                
                
                
                
                if not found:
                    if self.is_installed(repoq, spec):
                        found = True
                        res['results'].append('package providing %s is already installed' % (spec))
                if found:
                    continue