Vulnerability Description
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.
CVSS Score
HIGH
References
- 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
FAQ
What is CVE-2026-64555?
CVE-2026-64555 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 o...
How severe is CVE-2026-64555?
CVE-2026-64555 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-64555?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.