Possible Causes and Solutions on a Linux Server

• No yum sources have been configured.

  In this case, configure a yum source suitable for your Linux OS, and fix the vulnerability again.

• The yum source does not have the latest upgrade package of the corresponding software.

  Switch to the yum source having the required package and fix the vulnerability again.

• The intranet environment cannot connect to Internet.

  Servers need to access the Internet and use external yum sources to fix vulnerabilities. If your servers cannot access the Internet, or the external image sources cannot provide stable services, you can use the image source.

• The old kernel version remains.

  Old kernel versions often remain in servers after upgrade. You can run the verification commands to check whether the current kernel version meets the vulnerability fix requirements. If it does, ignore the vulnerability on the Linux Vulnerabilities tab of the Vulnerabilities page. You are not advised to delete the old kernel.

  Table 1 Verification commands

  OS	Verification Command
  CentOS/Fedora /Euler/Redhat/Oracle	rpm -qa | grep Software_name
  Debian/Ubuntu	dpkg -l | grep Software_name
  Gentoo	emerge --search Software_name