KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64555
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-27 21:17:08 UTC
Updated2026-08-17 05:18:01 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.001280000 probability, percentile 0.029180000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2de451a329cf662beeba71f63c7f83ee24ca6642 10a568010e827108d149779908850afaec898846 git Not specified
CNA Linux Linux affected 2de451a329cf662beeba71f63c7f83ee24ca6642 884b44256041ec6b2dcbe8e6a67384d26145cba1 git Not specified
CNA Linux Linux affected 2de451a329cf662beeba71f63c7f83ee24ca6642 dd3b237eb7780d65eae296d3d3a70012b6e7a02f git Not specified
CNA Linux Linux affected 2de451a329cf662beeba71f63c7f83ee24ca6642 ff1022c3de46753eb7eba2f6efd990569e66ff95 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/dd3b237eb7780d65eae296d3d3a70012b6e7a02f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ff1022c3de46753eb7eba2f6efd990569e66ff95 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/884b44256041ec6b2dcbe8e6a67384d26145cba1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/10a568010e827108d149779908850afaec898846 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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