GNU Hurd has an unspecified vulnerability (CNVD-2021-100612)

Gnu Hurd is a Gnu project replacement for the Unix kernel. A security vulnerability exists in GNU Hurd, which stems from the fact that in versions of GNU Hurd prior to 0.9 20210404-9 each person who maps a file shares a page navigation port, allowing anyone to modify any file they can read. any file they can read. An attacker could exploit this vulnerability to gain full root access.