kvmtool through 39181fc allows an out-of-bounds write, related to virtio/balloon.c and virtio/pci.c. This allows a guest OS user to execute arbitrary code on the host machine.Referenceshttps://cdn.discordapp.com/attachments/921419715170164776/921882173517230100/exploit.chttps://git.kernel.org/pub/scm/linux/kernel/git/will/kvmtool.git/log/https://www.kalmarunionen.dk/writeups/2021/hxp-2021/lkvm/https://git.kernel.org/pub/scm/linux/kernel/git/will/kvmtool.git/commit/?id=39181fc6429f4e9e71473284940e35857b42772a
