A new updated sudo package with the fix for the CVE-2021-23240 within CloudLinux OS 6 ELS has been scheduled for gradual rollout from our production repository.
Rollout slot: 10
Rolled out to: 1%
ETA for 100% rollout: July 20
sudo-1.8.6p3-32.el6.cloudlinux.els
yum update sudo*
yum update sudo* --enablerepo=cloudlinux-rollout-10-bypass