This issue affects version 219-62 of systemd as shipped with Kylin Enterprise Linux 7.
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A memory leak was discovered in the backport of fixes for CVE-2018-16864 in Kylin Enterprise Linux. Function dispatch_message_real() in journald-server.c does not free the memory allocated by set_iovec_field_free() to store the `_CMDLINE=` entry. A local attacker may use this flaw to make systemd-journald crash.