CVE:CVE-2021-27645
CNNVD:CNNVD-202102-1585
GNU C Library（glibc，libc6）是一种按照LGPL许可协议发布的开源免费的C语言编译程序。
GNU C Library (aka glibc or libc6) 2.29 版本到 2.33 版本存在资源管理错误漏洞，该漏洞源于缓存守护进程(nscd)在处理网络组查找请求时，可能会由于双free而崩溃。
solution:Upgrade gnu glibc to a higher version than 2.33,and avoid the version [2.29,2.33]; Upgrade fedoraproject fedora to a higher version than 33,34,and avoid the version 33,34; Upgrade debian debian_linux to a higher version than 10.0,and avoid the version 10.0