FKIE_CVE-2025-40068

Vulnerability from fkie_nvd - Published: 2025-10-28 12:15 - Updated: 2025-10-30 15:05
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: fs: ntfs3: Fix integer overflow in run_unpack() The MFT record relative to the file being opened contains its runlist, an array containing information about the file's location on the physical disk. Analysis of all Call Stack paths showed that the values of the runlist array, from which LCNs are calculated, are not validated before run_unpack function. The run_unpack function decodes the compressed runlist data format from MFT attributes (for example, $DATA), converting them into a runs_tree structure, which describes the mapping of virtual clusters (VCN) to logical clusters (LCN). The NTFS3 subsystem also has a shortcut for deleting files from MFT records - in this case, the RUN_DEALLOCATE command is sent to the run_unpack input, and the function logic provides that all data transferred to the runlist about file or directory is deleted without creating a runs_tree structure. Substituting the runlist in the $DATA attribute of the MFT record for an arbitrary file can lead either to access to arbitrary data on the disk bypassing access checks to them (since the inode access check occurs above) or to destruction of arbitrary data on the disk. Add overflow check for addition operation. Found by Linux Verification Center (linuxtesting.org) with SVACE.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ac37e100385b59ac821a62118494442238aaac4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5aa5799d162ad1b8e8b699d48b6218143c695a78
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/736fc7bf5f68f6b74a0925b7e072c571838657d2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9378cfe228c2c679564a4116bcb28c8e89dff989
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a86c8b9d03f7101e1750233846fe989df6f0d631
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f6b36cfd25cbadad63447c673743cf771090e756
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: ntfs3: Fix integer overflow in run_unpack()\n\nThe MFT record relative to the file being opened contains its runlist,\nan array containing information about the file\u0027s location on the physical\ndisk. Analysis of all Call Stack paths showed that the values of the\nrunlist array, from which LCNs are calculated, are not validated before\nrun_unpack function.\n\nThe run_unpack function decodes the compressed runlist data format\nfrom MFT attributes (for example, $DATA), converting them into a runs_tree\nstructure, which describes the mapping of virtual clusters (VCN) to\nlogical clusters (LCN). The NTFS3 subsystem also has a shortcut for\ndeleting files from MFT records - in this case, the RUN_DEALLOCATE\ncommand is sent to the run_unpack input, and the function logic\nprovides that all data transferred to the runlist about file or\ndirectory is deleted without creating a runs_tree structure.\n\nSubstituting the runlist in the $DATA attribute of the MFT record for an\narbitrary file can lead either to access to arbitrary data on the disk\nbypassing access checks to them (since the inode access check\noccurs above) or to destruction of arbitrary data on the disk.\n\nAdd overflow check for addition operation.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."
    }
  ],
  "id": "CVE-2025-40068",
  "lastModified": "2025-10-30T15:05:32.197",
  "metrics": {},
  "published": "2025-10-28T12:15:41.277",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3ac37e100385b59ac821a62118494442238aaac4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5aa5799d162ad1b8e8b699d48b6218143c695a78"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/736fc7bf5f68f6b74a0925b7e072c571838657d2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9378cfe228c2c679564a4116bcb28c8e89dff989"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a86c8b9d03f7101e1750233846fe989df6f0d631"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f6b36cfd25cbadad63447c673743cf771090e756"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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