{
  "cveId": "CVE-2025-38579",
  "url": "https://patchblox.com/security/cve/CVE-2025-38579",
  "summary": "CVE-2025-38579 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-38579, released August 19, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "f2fs: fix KMSAN uninit-value in extent_info usage",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix KMSAN uninit-value in extent_info usage  KMSAN reported a use of uninitialized value in \u0060__is_extent_mergeable()\u0060  and \u0060__is_back_mergeable()\u0060 via the read extent tree path.  The root cause is that \u0060get_read_extent_info()\u0060 only initializes three fields (\u0060fofs\u0060, \u0060blk\u0060, \u0060len\u0060) of \u0060struct extent_info\u0060, leaving the remaining fields uninitialized. This leads to undefined behavior when those fields are accessed later, especially during extent merging.  Fix it by zero-initializing the \u0060extent_info\u0060 struct before population.",
  "published": "2025-08-19T17:15:35Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00177,
  "epssPercentile": 0.07225,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38579",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.148-1",
      "fix": "DEBIAN-CVE-2025-38579",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-38579",
      "released": "2025-08-19T17:15:35Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.43-1",
      "fix": "DEBIAN-CVE-2025-38579",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-38579",
      "released": "2025-08-19T17:15:35Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.16.3-1",
      "fix": "DEBIAN-CVE-2025-38579",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-38579",
      "released": "2025-08-19T17:15:35Z"
    }
  ],
  "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"
  }
}