Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-CE0C8590-B628-11EA-9D28-3C970EE9157C:
Apple reports:
CVE-2019-8842: The ippReadIO function may under-read an
extension.
CVE-2020-3898: The ppdOpen function did not handle invalid UI
constraint. ppdcSource::get_resolution function did not handle
invalid resolution strings. An application may be able to gain
elevated privileges.
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