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Flaw bug created to hold information about an old flaw we knew something about. For more details see the MITRE CVE description.
MITRE description: The getgrouplist function in GNU libc (glibc) 2.2.4 and earlier allows attackers to cause a denial of service (segmentation fault) and execute arbitrary code when a user is a member of a large number of groups, which can cause a buffer overflow.