如何在CentOS或RHEL系统上检查可用的安全更新？

要统计全部安全补丁的大致数量，运行下面的命令：

# yum updateinfo list security all | wc -l
3522

下面根据已装软件列出可更新的安全补丁。这包括 bugzilla（bug 修复）、CVE（知名漏洞数据库）、安全更新等：

# yum updateinfo list security
 
或者
 
# yum updateinfo list sec
 
Loaded plugins: changelog, package_upload, product-id, search-disabled-repos,
              : subscription-manager, verify, versionlock
 
RHSA-2018:3665 Important/Sec. NetworkManager-1:1.12.0-8.el7_6.x86_64
RHSA-2018:3665 Important/Sec. NetworkManager-adsl-1:1.12.0-8.el7_6.x86_64
RHSA-2018:3665 Important/Sec. NetworkManager-bluetooth-1:1.12.0-8.el7_6.x86_64
RHSA-2018:3665 Important/Sec. NetworkManager-config-server-1:1.12.0-8.el7_6.noarch
RHSA-2018:3665 Important/Sec. NetworkManager-glib-1:1.12.0-8.el7_6.x86_64
RHSA-2018:3665 Important/Sec. NetworkManager-libnm-1:1.12.0-8.el7_6.x86_64
RHSA-2018:3665 Important/Sec. NetworkManager-ppp-1:1.12.0-8.el7_6.x86_64
RHSA-2018:3665 Important/Sec. NetworkManager-team-1:1.12.0-8.el7_6.x86_64
RHSA-2018:3665 Important/Sec. NetworkManager-tui-1:1.12.0-8.el7_6.x86_64
RHSA-2018:3665 Important/Sec. NetworkManager-wifi-1:1.12.0-8.el7_6.x86_64
RHSA-2018:3665 Important/Sec. NetworkManager-wwan-1:1.12.0-8.el7_6.x86_64

显示所有与安全相关的更新，并且返回一个结果来告诉你是否有可用的补丁：

# yum --security check-update
Loaded plugins: changelog, package_upload, product-id, search-disabled-repos, subscription-manager, verify, versionlock
rhel-7-server-rpms                                                                                                                            | 2.0 kB  00:00:00
--> policycoreutils-devel-2.2.5-20.el7.x86_64 from rhel-7-server-rpms excluded (updateinfo)
--> smc-raghumalayalam-fonts-6.0-7.el7.noarch from rhel-7-server-rpms excluded (updateinfo)
--> amanda-server-3.3.3-17.el7.x86_64 from rhel-7-server-rpms excluded (updateinfo)
--> 389-ds-base-libs-1.3.4.0-26.el7_2.x86_64 from rhel-7-server-rpms excluded (updateinfo)
--> 1:cups-devel-1.6.3-26.el7.i686 from rhel-7-server-rpms excluded (updateinfo)
--> openwsman-client-2.6.3-3.git4391e5c.el7.i686 from rhel-7-server-rpms excluded (updateinfo)
--> 1:emacs-24.3-18.el7.x86_64 from rhel-7-server-rpms excluded (updateinfo)
--> augeas-libs-1.4.0-2.el7_4.2.i686 from rhel-7-server-rpms excluded (updateinfo)
--> samba-winbind-modules-4.2.3-10.el7.i686 from rhel-7-server-rpms excluded (updateinfo)
--> tftp-5.2-11.el7.x86_64 from rhel-7-server-rpms excluded (updateinfo)
.
.
35 package(s) needed for security, out of 115 available
NetworkManager.x86_64                        1:1.12.0-10.el7_6            rhel-7-server-rpms
NetworkManager-adsl.x86_64                   1:1.12.0-10.el7_6            rhel-7-server-rpms
NetworkManager-bluetooth.x86_64              1:1.12.0-10.el7_6            rhel-7-server-rpms
NetworkManager-config-server.noarch          1:1.12.0-10.el7_6            rhel-7-server-rpms
NetworkManager-glib.x86_64                   1:1.12.0-10.el7_6            rhel-7-server-rpms
NetworkManager-libnm.x86_64                  1:1.12.0-10.el7_6            rhel-7-server-rpms
NetworkManager-ppp.x86_64                    1:1.12.0-10.el7_6            rhel-7-server-rpms

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