CVE-2026-46131

About vulnerability

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: check for nEPT/nNPT in slow flush hypercalls Checking is_guest_mode(vcpu) is incorrect, because translate_nested_gpa() is only valid if an L2 guest is running with nested EPT/NPT enabled. Instead use the same condition as translate_nested_gpa() itself. A flaw was found in the Linux kernel’s KVM (Kernel-based Virtual Machine) x86 virtualization module. An incorrect check for nested EPT/NPT (Nested Extended Page Tables/Nested Nested Page Tables) in slow flush hypercalls could lead to improper handling of L2 guests. This vulnerability arises because the is_guest_mode(vcpu) check was not sufficient, potentially allowing an L2 guest with nested EPT/NPT enabled to bypass intended security restrictions.

Live-patch status from KernelCare for each operating system.