{"api_version":"1","generated_at":"2026-08-22T17:47:28+00:00","cve":"CVE-2026-72280","urls":{"html":"https://cve.report/CVE-2026-72280","api":"https://cve.report/api/cve/CVE-2026-72280.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72280","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72280"},"summary":{"title":"KVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2\n\nIt is entirely possible for a guest to write to the ZCR_EL2 sysreg alias\nwhile in a nested context, as it is expected if FEAT_NV2 is advertised\nto the L1 hypervisor.\n\nGet rid of the bogus WARN which, since the hyp vectors were installed at\nthis point, has the effect of a hyp_panic...","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:58","updated_at":"2026-08-17 06:18:30"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","data":{"baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/7deadbc5dab5b8e2316364603bc6281129c8461c","name":"https://git.kernel.org/stable/c/7deadbc5dab5b8e2316364603bc6281129c8461c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6561597dba97e3e8479a9919bda172cf43eb902c","name":"https://git.kernel.org/stable/c/6561597dba97e3e8479a9919bda172cf43eb902c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5000bcae71c869cba6674c326fec2d8ad659ae3a","name":"https://git.kernel.org/stable/c/5000bcae71c869cba6674c326fec2d8ad659ae3a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9f1667098c6ae7ec81a9a56859cfdacb822aa0d0","name":"https://git.kernel.org/stable/c/9f1667098c6ae7ec81a9a56859cfdacb822aa0d0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72280","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72280","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f 6561597dba97e3e8479a9919bda172cf43eb902c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f 5000bcae71c869cba6674c326fec2d8ad659ae3a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f 7deadbc5dab5b8e2316364603bc6281129c8461c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0cfc85b8f5cf3b77463d61542191c75ba0cc3a5f 9f1667098c6ae7ec81a9a56859cfdacb822aa0d0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.11","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.11 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 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72280","cve":"CVE-2026-72280","epss":"0.001860000","percentile":"0.084760000","score_date":"2026-08-17","updated_at":"2026-08-18 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the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2\n\nIt is entirely possible for a guest to write to the ZCR_EL2 sysreg alias\nwhile in a nested context, as it is expected if FEAT_NV2 is advertised\nto the L1 hypervisor.\n\nGet rid of the bogus WARN which, since the hyp vectors were installed at\nthis point, has the effect of a hyp_panic..."}],"metrics":[{"cvssV3_1":{"baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is reached when guest code in a nested KVM context executes an MSR/MRS to ZCR_EL2 that traps to EL2, traversing KVM_RUN → hyp fast-path kvm_hyp_handle_zcr_el2() → kvm_hyp_handle_fpsimd(); this requires local guest execution on an arm64 VHE KVM host, not remote network input.\nAC:L - On arm64 VHE hosts with nested virtualization (FEAT_NV2) and SVE enabled, a tenant guest in nested context (L1 non-hyp or L2) can deterministically issue the ZCR_EL2 access that hits the bogus WARN; the attacker controls the trap timing and FP/SVE lazy-switch preconditions without uncontrollable host races.\nPR:N - No host root or init-namespace capabilities are required—exploitation needs only code execution inside an assigned KVM guest with nested virtualization and SVE enabled (typical nested-virt ARM cloud tenant), not privileged access on the physical host itself.\nUI:N - No victim user or administrator action is required beyond the attacker operating their own nested/SVE-enabled guest workload; triggering is fully automated via a single guest MSR to ZCR_EL2 that traps into the hypervisor fast path.\nS:C - A guest-triggered WARN in EL2 hypervisor code escalates to hyp_panic(), crashing the host kernel and denying all co-resident VMs—crossing the guest-to-host KVM virtualization security boundary even though exploitation is denial-of-service rather than memory corruption.\nC:N - The failure mode is WARN_ON_ONCE → hyp_panic with no out-of-bounds access, use-after-free, or memory corruption; it is a deterministic hypervisor assertion panic without an information disclosure or memory-read primitive.\nI:N - No guest-controlled kernel memory write or control-flow hijack occurs; the bogus WARN aborts via hyp_panic before any exploitable state mutation beyond crashing the host, and the removed check was incorrectly rejecting a legitimate nested ZCR_EL2 write path.\nA:H - WARN_ON_ONCE in EL2 with hyp vectors installed invokes hyp_panic() and host panic(), immediately denying availability of the hypervisor and every VM on the affected arm64 KVM host; the attack is repeatable on each ZCR_EL2 trap while nested virt and SVE remain enabled."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:42:15.995Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/6561597dba97e3e8479a9919bda172cf43eb902c"},{"url":"https://git.kernel.org/stable/c/5000bcae71c869cba6674c326fec2d8ad659ae3a"},{"url":"https://git.kernel.org/stable/c/7deadbc5dab5b8e2316364603bc6281129c8461c"},{"url":"https://git.kernel.org/stable/c/9f1667098c6ae7ec81a9a56859cfdacb822aa0d0"}],"title":"KVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72280","datePublished":"2026-08-15T05:55:04.969Z","dateReserved":"2026-08-09T03:40:39.916Z","dateUpdated":"2026-08-17T05:42:15.995Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:58","lastModifiedDate":"2026-08-17 06:18:30","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":4}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72280","Ordinal":"1","Title":"KVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2","CVE":"CVE-2026-72280","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72280","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2\n\nIt is entirely possible for a guest to write to the ZCR_EL2 sysreg alias\nwhile in a nested context, as it is expected if FEAT_NV2 is advertised\nto the L1 hypervisor.\n\nGet rid of the bogus WARN which, since the hyp vectors were installed at\nthis point, has the effect of a hyp_panic...","Type":"Description","Title":"KVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2"}]}}}