An OOB heap buffer r/w access issue was found in the NVM Express Controller emulation in QEMU. It could occur in nvme_cmb_ops routines in nvme device. A guest user/process could use this flaw to crash the QEMU process resulting in DoS or potentially run arbitrary code with privileges of the QEMU process.
https://www.openwall.com/lists/oss-security/2018/11/02/1
https://usn.ubuntu.com/3826-1/
https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg00200.html