rom_copy() in hw/core/loader.c in QEMU 4.0 and 4.1.0 does not validate the relationship between two addresses, which allows attackers to trigger an invalid memory copy operation.
git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=e423455c4f23a1a828901c78fe6d03b7dde79319
github.com/qemu/qemu/commit/4f1c6cb2f9afafda05eab150fd2bd284edce6676
lists.debian.org/debian-lts-announce/2020/06/msg00032.html
lists.debian.org/debian-lts-announce/2020/07/msg00020.html
security.netapp.com/advisory/ntap-20200619-0006/
usn.ubuntu.com/4467-1/
www.openwall.com/lists/oss-security/2020/06/03/6