{
  "cveId": "CVE-2026-89907",
  "url": "https://patchblox.com/security/cve/CVE-2026-89907",
  "summary": "CVE-2026-89907 is fixed in linux on 1 platform by DEBIAN-CVE-2026-89907 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "LoongArch: KVM: Validate MSI data before routing it to EIOINTC",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  LoongArch: KVM: Validate MSI data before routing it to EIOINTC  pch_msi_set_irq() passes e-\u003Emsi.data straight into eiointc_set_irq() as the irq number. The MSI data comes from userspace, that either via a KVM_IRQ_ROUTING_MSI entry set with KVM_SET_GSI_ROUTING (used by irqfd and KVM_IRQ_LINE) or directly via KVM_SIGNAL_MSI, and is never checked against EIOINTC_IRQS.  eiointc_set_irq() uses the value with __set_bit()/__clear_bit() on the 256-bit isr bitmap, eiointc_update_irq() then indexes sw_coremap[] and the per-cpu coreisr/sw_coreisr bitmaps with it. Therefore a data value \u003E= 256 reads and writes memory past the end of those arrays, i.e. any process holding a VM fd can corrupt kernel memory beyond the allocation of loongarch_eiointc.  Reject MSI data that doesn\u0027t fit in the EIOINTC irq space. The DMSINTC path is unaffected as it decodes the vector from the address and masks it.",
  "published": "2026-09-16T11:16:59Z",
  "severity": "high",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
  "epss": 0.00173,
  "epssPercentile": 0.06812,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89907",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89907",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89907",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}