Memory leak in the v9fs_list_xattr function in hw/9pfs/9p-xattr.c in QEMU (aka Quick Emulator) allows local guest OS privileged users to cause a denial of service (memory consumption) via vectors involving the orig_value variable.
https://bugzilla.redhat.com/show_bug.cgi?id=1444781
https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
https://lists.gnu.org/archive/html/qemu-devel/2017-04/msg01636.html