{
  "cveId": "CVE-2026-90191",
  "url": "https://patchblox.com/security/cve/CVE-2026-90191",
  "summary": "CVE-2026-90191 is fixed in linux on 1 platform by DEBIAN-CVE-2026-90191 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "mailbox: riscv-sbi-mpxy: validate RPMI notification lengths",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mailbox: riscv-sbi-mpxy: validate RPMI notification lengths  The SBI return value controls how many bytes are copied from shared memory into the RPMI notification buffer. It is not validated against the negotiated shared-memory size before that copy. The event walker also uses a reversed loop condition and can inspect a short event record.  Validate the complete notification length before copying it, iterate only while a full event header remains, and stop when a declared event payload extends beyond the copied notification data.",
  "published": "2026-09-17T17:17:13Z",
  "severity": "high",
  "cvss": 8.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00178,
  "epssPercentile": 0.07433,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90191",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90191",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90191",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}