{"api_version":"1","generated_at":"2026-07-28T01:58:03+00:00","cve":"CVE-2026-64555","urls":{"html":"https://cve.report/CVE-2026-64555","api":"https://cve.report/api/cve/CVE-2026-64555.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64555","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64555"},"summary":{"title":"KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()\n\nkvm_hyp_handle_mops() resets the single-step state machine as part of\nrewinding state for a MOPS exception by modifying vcpu_cpsr() and\nwriting the result directly into hardware.\n\nIn the case of nested virtualization, vcpu_cpsr() is a synthetic value\nsuch that the rest of KVM can deal with vEL2 cleanly. That means the\nvalue requires translation before being written into hardware, which is\nunfortunately missing from the MOPS handler.\n\nFix it by directly modifying SPSR_EL2 and avoiding the synthetic state\naltogether, which will be resynchronized on the next 'full' exit back\nto KVM.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-27 21:17:08","updated_at":"2026-07-27 21:17:08"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/dd3b237eb7780d65eae296d3d3a70012b6e7a02f","name":"https://git.kernel.org/stable/c/dd3b237eb7780d65eae296d3d3a70012b6e7a02f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ff1022c3de46753eb7eba2f6efd990569e66ff95","name":"https://git.kernel.org/stable/c/ff1022c3de46753eb7eba2f6efd990569e66ff95","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/884b44256041ec6b2dcbe8e6a67384d26145cba1","name":"https://git.kernel.org/stable/c/884b44256041ec6b2dcbe8e6a67384d26145cba1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/10a568010e827108d149779908850afaec898846","name":"https://git.kernel.org/stable/c/10a568010e827108d149779908850afaec898846","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64555","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64555","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2de451a329cf662beeba71f63c7f83ee24ca6642 10a568010e827108d149779908850afaec898846 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2de451a329cf662beeba71f63c7f83ee24ca6642 884b44256041ec6b2dcbe8e6a67384d26145cba1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2de451a329cf662beeba71f63c7f83ee24ca6642 dd3b237eb7780d65eae296d3d3a70012b6e7a02f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2de451a329cf662beeba71f63c7f83ee24ca6642 ff1022c3de46753eb7eba2f6efd990569e66ff95 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc4 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/arm64/kvm/hyp/include/hyp/switch.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"10a568010e827108d149779908850afaec898846","status":"affected","version":"2de451a329cf662beeba71f63c7f83ee24ca6642","versionType":"git"},{"lessThan":"884b44256041ec6b2dcbe8e6a67384d26145cba1","status":"affected","version":"2de451a329cf662beeba71f63c7f83ee24ca6642","versionType":"git"},{"lessThan":"dd3b237eb7780d65eae296d3d3a70012b6e7a02f","status":"affected","version":"2de451a329cf662beeba71f63c7f83ee24ca6642","versionType":"git"},{"lessThan":"ff1022c3de46753eb7eba2f6efd990569e66ff95","status":"affected","version":"2de451a329cf662beeba71f63c7f83ee24ca6642","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/arm64/kvm/hyp/include/hyp/switch.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.7"},{"lessThan":"6.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc4","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"6.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"6.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"6.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc4","versionStartIncluding":"6.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()\n\nkvm_hyp_handle_mops() resets the single-step state machine as part of\nrewinding state for a MOPS exception by modifying vcpu_cpsr() and\nwriting the result directly into hardware.\n\nIn the case of nested virtualization, vcpu_cpsr() is a synthetic value\nsuch that the rest of KVM can deal with vEL2 cleanly. That means the\nvalue requires translation before being written into hardware, which is\nunfortunately missing from the MOPS handler.\n\nFix it by directly modifying SPSR_EL2 and avoiding the synthetic state\naltogether, which will be resynchronized on the next 'full' exit back\nto KVM."}],"providerMetadata":{"dateUpdated":"2026-07-27T20:10:42.259Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/10a568010e827108d149779908850afaec898846"},{"url":"https://git.kernel.org/stable/c/884b44256041ec6b2dcbe8e6a67384d26145cba1"},{"url":"https://git.kernel.org/stable/c/dd3b237eb7780d65eae296d3d3a70012b6e7a02f"},{"url":"https://git.kernel.org/stable/c/ff1022c3de46753eb7eba2f6efd990569e66ff95"}],"title":"KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64555","datePublished":"2026-07-27T20:10:42.259Z","dateReserved":"2026-07-19T15:36:31.796Z","dateUpdated":"2026-07-27T20:10:42.259Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-27 21:17:08","lastModifiedDate":"2026-07-27 21:17:08","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64555","Ordinal":"1","Title":"KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()","CVE":"CVE-2026-64555","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64555","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()\n\nkvm_hyp_handle_mops() resets the single-step state machine as part of\nrewinding state for a MOPS exception by modifying vcpu_cpsr() and\nwriting the result directly into hardware.\n\nIn the case of nested virtualization, vcpu_cpsr() is a synthetic value\nsuch that the rest of KVM can deal with vEL2 cleanly. That means the\nvalue requires translation before being written into hardware, which is\nunfortunately missing from the MOPS handler.\n\nFix it by directly modifying SPSR_EL2 and avoiding the synthetic state\naltogether, which will be resynchronized on the next 'full' exit back\nto KVM.","Type":"Description","Title":"KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()"}]}}}