QEMU 4.2.0 has a use-after-free in hw/net/e1000e_core.c because a guest OS user can trigger an e1000e packet with the data's address set to the e1000e's MMIO address.
https://www.openwall.com/lists/oss-security/2020/07/21/3
https://security.gentoo.org/glsa/202208-27
https://lists.gnu.org/archive/html/qemu-devel/2020-07/msg05304.html
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html