Xen is a bare-metal hypervisor.
An out-of-bounds read/write access issue was found in the USB emulator when using QEMU.
A remote attacker could possibly execute arbitrary code with the privileges of the process or cause a Denial of Service condition.
There is no known workaround at this time.
All Xen users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-emulation/xen-4.13.1-r3"
All Xen tools users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose
">=app-emulation/xen-tools-4.13.1-r3"