qemu-bridge-helper.c in QEMU 3.1 and 4.0.0 does not ensure that a network interface name (obtained from bridge.conf or a --br=bridge option) is limited to the IFNAMSIZ size, which can lead to an ACL bypass.
lists.opensuse.org/opensuse-security-announce/2019-09/msg00000.html
lists.opensuse.org/opensuse-security-announce/2019-09/msg00008.html
www.openwall.com/lists/oss-security/2019/07/02/2
www.securityfocus.com/bid/109054
github.com/qemu/qemu/commit/03d7712b4bcd47bfe0fe14ba2fffa87e111fa086
lists.debian.org/debian-lts-announce/2019/09/msg00021.html
lists.gnu.org/archive/html/qemu-devel/2019-07/msg00145.html
seclists.org/bugtraq/2019/Aug/41
seclists.org/bugtraq/2019/Sep/3
security.gentoo.org/glsa/202003-66
usn.ubuntu.com/4191-1/
usn.ubuntu.com/4191-2/
www.debian.org/security/2019/dsa-4506
www.debian.org/security/2019/dsa-4512