Several memory leaks were found in the virtio vhost-user GPU device (vhost-user-gpu) of QEMU in versions up to and including 6.0. They exist in contrib/vhost-user-gpu/vhost-user-gpu.c and contrib/vhost-user-gpu/virgl.c due to improper release of memory (i.e., free) after effective lifetime.
https://www.debian.org/security/2021/dsa-4980
https://security.netapp.com/advisory/ntap-20210720-0008/
https://security.gentoo.org/glsa/202208-27