Kernel: KVM: leak of uninitialized stack contents to guest

An information leakage issue was found in the way Linux kernel's KVM hypervisor handled page fault exceptions while emulating instructions like VMXON, VMCLEAR, VMPTRLD, and VMWRITE with memory address as an operand. It occurs if the operand is a mmio address, as the returned exception object hold...

KVM (Nested Virtualization) - L1 Guest Privilege Escalation Vulnerability

Exploit for linux platform in category dos / poc When KVM on Intel virtualizes another hypervisor as L1 VM it does not verify that VMX instructions from the L1 VM which trigger a VM exit and are emulated by L0 KVM are coming from ring 0. For code running on bare metal or VMX root mode this is...

KVM (Nested Virtualization) - L1 Guest Privilege Escalation

When KVM on Intel virtualizes another hypervisor as L1 VM it does not verify that VMX instructions from the L1 VM which trigger a VM exit and are emulated by L0 KVM are coming from ring 0. For code running on bare metal or VMX root mode this is enforced by hardware. However, for code running in L...