{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64106",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64106"
  ],
  "published": "2026-07-19T15:41:06Z",
  "summary": "KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits\n\nUserspace can restore an ITS Device Table Entry whose Size field encodes\nmore EventID bits than the virtual ITS supports.  The live MAPD path\nrejects that state, but vgic_its_restore_dte() accepts it and stores the\nout-of-range value in dev->num_eventid_bits.\n\nReject restored DTEs with num_eventid_bits > VITS_TYPER_IDBITS before\nallocating the device.  This mirrors the MAPD check and prevents the\nrestored state from reaching vgic_its_restore_itt(), where the unchecked\nvalue can be converted into an oversized scan_its_table() range.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64106"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1716b7fea2ead941a0dfac06c4504a3437cdf00d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dab9f93251b2c86a033de6098d0c73afddd55d4a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b94538186a3eae3763b8f96dacd610920a865aa7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0680f511926589206f81f57f76ce131d7741a316"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8bcd15b690a390241179516af1b6ae49ebfd9d95"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9ce754ed8e7ab4e3999767ce1505f85c449ccb07"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.0,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:L - The bug is reached only through the KVM device ioctl path (KVM_SET_DEVICE_ATTR with KVM_DEV_ARM_ITS_RESTORE_TABLES), which requires a local process with access to a VM file descriptor; it is not triggered by network packets or guest MMIO/ITS commands.\nAC:L - An attacker can reliably plant a crafted Device Table Entry in guest RAM (Size field encoding 17\u201332 EventID bits) and have it processed during migration/snapshot restore; no race or attacker-uncontrollable memory layout is required, and the live MAPD path already proves the invalid state is straightforward to supply.\nPR:N - The highest-impact scenario is a malicious cloud VM tenant who needs no host privileges: they write a malformed DTE directly into guest physical memory (bypassing MAPD validation) and trigger host-side restore during automated live migration or snapshot resume, without requiring /dev/kvm or root on the host.\nUI:N - Exploitation does not require victim interaction beyond normal hypervisor operations such as automated live migration or snapshot restore that the attacker can initiate as a VM tenant; no end-user action like opening a file is needed.\nS:C - The vulnerability crosses the VM security boundary because guest-controlled saved state causes the host kernel to perform an oversized ITS table scan and mass kernel allocations, impacting host availability outside the guest's security scope.\nC:H - The unchecked num_eventid_bits value inflates scan_its_table()'s range up to BIT_ULL(32)*8 bytes (and can wrap the int size parameter for values 28\u201331), causing the host kernel to read far beyond the valid ITT bounds through kvm_read_guest_lock across a large guest GPA span.\nI:N - The flaw causes excessive guest-memory reads and kernel object allocation but does not corrupt or write host kernel memory; there is no demonstrated arbitrary host write, use-after-free, or code-execution primitive from this bug alone.\nA:H - The oversized scan can loop for an enormous number of kvm_read_guest_lock iterations (worse when the truncated int size wraps to a huge unsigned length), and valid-looking restored ITEs can drive unbounded vgic_add_lpi/kzalloc allocations, exhausting host CPU and memory and causing severe denial of service."
    }
  }
}