{
  "cveId": "CVE-2025-40004",
  "url": "https://patchblox.com/security/cve/CVE-2025-40004",
  "summary": "CVE-2025-40004 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-40004, released October 20, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net/9p: Fix buffer overflow in USB transport lay...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/9p: Fix buffer overflow in USB transport layer  A buffer overflow vulnerability exists in the USB 9pfs transport layer where inconsistent size validation between packet header parsing and actual data copying allows a malicious USB host to overflow heap buffers.  The issue occurs because: - usb9pfs_rx_header() validates only the declared size in packet header - usb9pfs_rx_complete() uses req-\u003Eactual (actual received bytes) for memcpy  This allows an attacker to craft packets with small declared size (bypassing validation) but large actual payload (triggering overflow in memcpy).  Add validation in usb9pfs_rx_complete() to ensure req-\u003Eactual does not exceed the buffer capacity before copying data.",
  "published": "2025-10-20T06:15:36Z",
  "severity": "",
  "epss": 0.00267,
  "epssPercentile": 0.18953,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.57-1",
      "fix": "DEBIAN-CVE-2025-40004",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40004",
      "released": "2025-10-20T06:15:36Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.17.6-1",
      "fix": "DEBIAN-CVE-2025-40004",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40004",
      "released": "2025-10-20T06:15:36Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}