CVE:CVE-2021-3472
CNNVD:CNNVD-202104-743
X.Org X Server是X.Org（X.org）基金会的一款X Window系统显示服务器。
X.Org Server 存在数字错误漏洞，该漏洞允许本地用户升级系统上的特权。这是由于XChangeFeedbackControl()函数内的整数下溢。
solution:Upgrade x.org x_server to a higher version than 1.20.11,and avoid the version (,1.20.11); Upgrade fedoraproject fedora to a higher version than 32,33,34,and avoid the version 32,33,34; Upgrade debian debian_linux to a higher version than 9.0,10.0,and avoid the version 9.0,10.0; Upgrade redhat enterprise_linux to a higher version than 7.0,8.0,and avoid the version 7.0,8.0