系统漏洞修复问题yum update kernel-devel 无法更新

阿里云提示安全问题，给出的修复建议命令是 ： yum update kernel-devel
但是执行该命令没有任何更新？
[root@iz2zegmt1v7v6dnpoy0uoqz src]# yum update kernel-devel
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
base                                                                                                                                                                          | 3.6 kB  00:00:00    
epel                                                                                                                                                                          | 4.3 kB  00:00:00    
extras                                                                                                                                                                        | 3.4 kB  00:00:00    
updates                                                                                                                                                                       | 3.4 kB  00:00:00    
No packages marked for update






查看yum.repos.d

[root@iz2zegmt1v7v6dnpoy0uoqz src]# ls -l /etc/yum.repos.d/  
total 36
-rw-r--r-- 1 root root  675 May  8 11:01 CentOS-Base-Aliyun.repo
-rw-r--r-- 1 root root 1664 Nov 30  2016 CentOS-Base.repo
-rw-r--r-- 1 root root 1309 Nov 30  2016 CentOS-CR.repo
-rw-r--r-- 1 root root  649 Nov 30  2016 CentOS-Debuginfo.repo
-rw-r--r-- 1 root root  314 Nov 30  2016 CentOS-fasttrack.repo
-rw-r--r-- 1 root root  630 Nov 30  2016 CentOS-Media.repo
-rw-r--r-- 1 root root 1331 Nov 30  2016 CentOS-Sources.repo
-rw-r--r-- 1 root root 2893 Nov 30  2016 CentOS-Vault.repo
-rw-r--r-- 1 root root  230 May  8 11:01 epel-Aliyun.repo