Qemu has a Buffer Overflow in pcnet_receive in hw/net/pcnet.c because an incorrect integer data type is used.
https://www.suse.com/security/cve/CVE-2018-17962/
https://www.debian.org/security/2018/dsa-4338
https://usn.ubuntu.com/3826-1/
https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg03268.html
https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
https://linux.oracle.com/cve/CVE-2018-17962.html
https://access.redhat.com/security/cve/cve-2018-17962