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Logue no SSH e digite:

su -
sudo -i

yum list updates

yum update

yum clean all
yum update glibc* yum* rpm* python*
yum update

reboot

cat /etc/redhat-release

Vai aparecer desse modo 
CentOS release 5.10 (Final)

lsb_release -a
## Output ##
LSB Version:    :core-4.0-amd64:core-4.0-ia32:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-ia32:printing-4.0-noarch
Distributor ID: CentOS
Description:    CentOS release 5.10 (Final)
Release:        5.10
Codename:       Final


Pronto você atualizou o centOs