CVE-2026-64555
Description
AI Translation Available
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.
https://git.kernel.org/stable/c/10a568010e827108d149779908850afaec898846
https://git.kernel.org/stable/c/884b44256041ec6b2dcbe8e6a67384d26145cba1
https://git.kernel.org/stable/c/dd3b237eb7780d65eae296d3d3a70012b6e7a02f
https://git.kernel.org/stable/c/ff1022c3de46753eb7eba2f6efd990569e66ff95