{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-71311",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-71311"
  ],
  "published": "2026-05-27T12:23:36Z",
  "summary": "fs/ntfs3: Initialize new folios before use",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: Initialize new folios before use\n\nKMSAN reports an uninitialized value in longest_match_std(), invoked\nfrom ntfs_compress_write(). When new folios are allocated without being\nmarked uptodate and ni_read_frame() is skipped because the caller expects\nthe frame to be completely overwritten, some reserved folios may remain\nonly partially filled, leaving the rest memory uninitialized.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-71311"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dd6c81527d097b3b0bf5a15c2fdc9657d045144c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5a30cc03bde169ad558695b26da6ea7e55f6194a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/41d79f8e2a36622d148719bf7c18b46ac1264284"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f223ebffa185cc8da934333c5a31ff2d4f992dc9"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.2,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - A remote SMB or NFS client can reach ntfs3's write path when a compressed NTFS volume is exported by ksmbd or nfsd. Writable NTFS-backed network shares are a reasonable NAS/server deployment.\nAC:L - No race is required; the attacker controls the write offset and length and can reliably end a write inside a newly allocated compression frame.\nPR:N - ksmbd supports anonymous guest-writable shares, including compressed directories whose new files inherit compression, so exploitation can require no credentials.\nUI:N - Once the share and filesystem are available, the attacker can perform the write, EOF extension, and read without victim interaction.\nS:U - The disclosure and limited data corruption remain within the host kernel and its filesystem security authority.\nC:H - Unfilled portions of an 8\u201364 KiB frame contain stale allocator data but are compressed, persisted, and marked uptodate. Extending EOF and reading can expose substantial kernel or cross-process memory, and the process can be repeated.\nI:L - Uninitialized bytes can become file contents instead of the required zero-filled extension, causing limited and value-uncontrolled data modification. The bug does not provide an arbitrary kernel write or control-flow primitive.\nA:N - The compression code keeps pointers, indexes, and output sizes bounded, so the uninitialized values do not crash a normal kernel. A KMSAN diagnostic on specially instrumented kernels is not a production availability impact."
    }
  }
}