KVM (Kernel-based Virtual Machine) is a full virtualization solution forLinux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built forthe standard Red Hat Enterprise Linux kernel.A data structure field in kvm_vcpu_ioctl_x86_get_vcpu_events() in QEMU-KVMwas not initialized properly before being copied to user-space. Aprivileged host user with access to "/dev/kvm" could use this flaw to leakkernel stack memory to user-space. (CVE-2010-4525)Red Hat would like to thank Stephan Mueller of atsec information securityfor reporting this issue.These updated packages also fix several bugs. Documentation for these bugfixes will be available shortly in the "kvm" section of the Red HatEnterprise Linux 5.6 Technical Notes, linked to in the References.All KVM users should upgrade to these updated packages, which resolve thisissue as well as fixing the bugs noted in the Technical Notes. Note: Theprocedure in the Solution section must be performed before this update willtake effect.