Threats Tagged 'cve-2026-64555'

A vulnerability in the Linux kernel's KVM module for arm64 architecture was resolved. The issue involved incorrect handling of the SPSR_EL2 register restore in the kvm_hyp_handle_mops() function during nested virtualization. The function failed to translate a synthetic value before writing it to hardware, potentially causing state inconsistencies. The fix modifies SPSR_EL2 directly, avoiding the synthetic state and ensuring proper synchronization on exit back to KVM.

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops() kvm_hyp_handle_mops() resets the single-step state machine as part of rewinding state for a MOPS exception by modifying vcpu_cpsr() and writing the result directly into hardware. In the case of nested virtualization, vcpu_cpsr() is a synthetic value such that the rest of KVM can deal with vEL2 cleanly. That means the value requires translation before being written into hardware, which is unfortunately missing from the MOPS handler. Fix it by directly modifying SPSR_EL2 and avoiding the synthetic state altogether, which will be resynchronized on the next 'full' exit back to KVM.