{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72280",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72280"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "KVM: arm64: nv: Drop bogus WARN for write to ZCR_EL2",
  "details": "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...",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72280"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6561597dba97e3e8479a9919bda172cf43eb902c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5000bcae71c869cba6674c326fec2d8ad659ae3a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7deadbc5dab5b8e2316364603bc6281129c8461c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9f1667098c6ae7ec81a9a56859cfdacb822aa0d0"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "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 \u2192 hyp fast-path kvm_hyp_handle_zcr_el2() \u2192 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\u2014exploitation 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\u2014crossing 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 \u2192 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."
    }
  }
}