{
  "cveId": "CVE-2026-74573",
  "url": "https://patchblox.com/security/cve/CVE-2026-74573",
  "summary": "CVE-2026-74573 is fixed in linux on 1 platform by DEBIAN-CVE-2026-74573 (version 7.1.8-1), released August 16, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  iommu/arm-smmu-v3-iommufd: Require exactly one S...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE  arm_vsmmu_vsid_to_sid() maps a guest\u0027s vSID to a single physical Stream ID taken from master-\u003Estreams[0], assuming a device has exactly one stream. A device with several streams gets only its first one mapped, so a guest vSID invalidation cannot reach the others\u0027 ATC and IOTLB entries; a device with none makes master-\u003Estreams a ZERO_SIZE_PTR, read out of bounds.  Add an arm_vsmmu_vdevice_init() op to reject the vDEVICE with -EOPNOTSUPP when master-\u003Enum_streams is not one, rather than mapping it silently.",
  "published": "2026-08-15T13:18:02Z",
  "severity": "critical",
  "cvss": 9.3,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
  "epss": 0.00131,
  "epssPercentile": 0.02695,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.8-1",
      "fix": "DEBIAN-CVE-2026-74573",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-74573",
      "released": "2026-08-16T22:48:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}