The Simple Protocol for Independent Computing Environments (SPICE) is aremote display protocol used in Red Hat Enterprise Linux for viewingvirtualized guests running on the Kernel-based Virtual Machine (KVM)hypervisor, or on Red Hat Enterprise Virtualization Hypervisor.It was found that the libspice component of QEMU-KVM on the host did notvalidate all pointers provided from a guest system's QXL graphics carddriver. A privileged guest user could use this flaw to cause the host todereference an invalid pointer, causing the guest to crash (denial ofservice) or, possibly, resulting in the privileged guest user escalatingtheir privileges on the host. (CVE-2010-0428)It was found that the libspice component of QEMU-KVM on the host could beforced to perform certain memory management operations on memory addressescontrolled by a guest. A privileged guest user could use this flaw to crashthe guest (denial of service) or, possibly, escalate their privileges onthe host. (CVE-2010-0429)All qspice users should upgrade to these updated packages, which containbackported patches to correct these issues.