CVE:CVE-2021-3939
CNNVD:CNNVD-202111-1504
Canonical Ubuntu是英国科能（Canonical）公司的一套以桌面应用为主的GNU/Linux操作系统。
Canonical Ubuntu 存在安全漏洞，该漏洞源于 Ubuntu 对accountsservice 的特定修改导致在user_change_language_authorized_cb 函数中指向静态存储的fallback_locale 变量被释放。
solution:Upgrade canonical accountsservice to a higher version than 0.6.55-0ubuntu12\~20.05,0.6.55-0ubuntu13.3,0.6.55-0ubuntu14.1,and avoid the version [0.6.55-0ubuntu12\~20.04,0.6.55-0ubuntu12\~20.05),[0.6.55-0ubuntu13,0.6.55-0ubuntu13.3),[0.6.55-0ubuntu14,0.6.55-0ubuntu14.1); Upgrade canonical ubuntu_linux to a higher version than 20.04,21.04,21.10,and avoid the version 20.04,21.04,21.10