CVE-2026-64555 is a vulnerability in Linux Kernel
Published on July 27, 2026
KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()
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.
Products Associated with CVE-2026-64555
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Affected Versions
Linux:- Version 2de451a329cf662beeba71f63c7f83ee24ca6642 and below 10a568010e827108d149779908850afaec898846 is affected.
- Version 2de451a329cf662beeba71f63c7f83ee24ca6642 and below 884b44256041ec6b2dcbe8e6a67384d26145cba1 is affected.
- Version 2de451a329cf662beeba71f63c7f83ee24ca6642 and below dd3b237eb7780d65eae296d3d3a70012b6e7a02f is affected.
- Version 2de451a329cf662beeba71f63c7f83ee24ca6642 and below ff1022c3de46753eb7eba2f6efd990569e66ff95 is affected.
- Version 6.7 is affected.
- Before 6.7 is unaffected.
- Version 6.12.97, <= 6.12.* is unaffected.
- Version 6.18.40, <= 6.18.* is unaffected.
- Version 7.1.5, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.