{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-22081",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-22081"
  ],
  "published": "2025-04-16T14:14:59Z",
  "summary": "fs/ntfs3: Fix a couple integer overflows on 32bit systems",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: Fix a couple integer overflows on 32bit systems\n\nOn 32bit systems the \"off + sizeof(struct NTFS_DE)\" addition can\nhave an integer wrapping issue.  Fix it by using size_add().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "database_specific": {
        "per_version": {
          "1:6.12.19-1+rpt1~bpo12+1": {
            "linux_commit": "121c2c384b9c2f4790ffb31b2cd25c7d75c8fda0",
            "upstream_version": "6.12.19",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.23"
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            "assessment": "commit ancestry (strak rule)",
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            "assessment": "commit ancestry (strak rule)",
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-22081"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0922d86a7a6032cb1694eab0b44b861bd33ba8d5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1a14e9718a19d2e88de004a1360bfd7a86ed1395"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0dfe700fbd3525f30a36ffbe390a5b9319bd009a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/284c9549386e9883855fb82b730303bb2edea9de"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0538f52410b619737e663167b6a2b2d0bc1a589d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4d0f4f42922a832388a0c2fe5204c0a1037ff786"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5ad414f4df2294b28836b5b7b69787659d6aa708"
    }
  ],
  "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": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable parser only runs against on-disk NTFS metadata, so the attacker must get a crafted image mounted locally (attacker-supplied removable media auto-mounted by udisks2/autofs, a loop-mounted image, or a privileged container) and then reach `hdr_find_e()` with a local `stat()`/`open()` on a path inside the malicious directory. No remote peer or network protocol touches this code.\nAC:L - The wrap is deterministic and fully attacker-authored: setting `de_off` to `0xFFFFFFF0` in the crafted index root defeats both `index_hdr_check()` and `hdr_find_e()`'s gate every time, and the resulting `offs[0] = 0xFFF0` entry is reached by the very first binary-search step. No race, no timing window, and the 32-bit kernel is a property of the targeted deployment (i686 distros, ARM32 embedded/industrial, 32-bit Android) rather than a condition the attacker must win.\nPR:L - Mounting `ntfs3` nominally needs `CAP_SYS_ADMIN` (no `FS_USERNS_MOUNT`), but on desktop, kiosk and shared-workstation deployments an ordinary logged-in user gets attacker-supplied media mounted for them by udisks2/polkit, and every step that actually drives the bug \u2014 the path lookup, the file write that triggers `ni_update_parent()` \u2014 is an unprivileged file operation. Scoring the lower-privilege reachable path.\nUI:N - No second user has to act: the automounter mounts the attacker's own device without any victim interaction, and the attacker then performs the triggering `stat()`, `ftruncate()` and writeback themselves. In the loop-mount and privileged-container variants the attacker likewise performs the mount directly.\nS:U - The out-of-bounds reads and the `indx_update_dup()` write all land in kernel slab memory and stay within the kernel's own security authority \u2014 no hypervisor, IOMMU, or container/VM boundary is crossed.\nC:H - `Add2Ptr(hdr, offs[mid_idx])` yields a pointer 65520 bytes past a 1 KB MFT record or 4 KB index buffer, and that OOB memory is then interpreted as a directory entry \u2014 its `ref` field is passed to `ntfs_iget5()`, and `cmp_fnames()` compares its name bytes against the attacker's lookup string, giving a repeatable oracle that lets the attacker read back adjacent kernel heap contents byte by byte.\nI:H - The out-of-bounds entry pointer returned by `hdr_find_e()` flows into `indx_update_dup()`, whose `memcpy(&e_fname->dup, dup, sizeof(*dup))` performs a 0x38-byte heap write ~64 KB out of bounds with content the attacker chooses (`data_size`/`alloc_size` via `ftruncate`, four timestamps via `utimensat`) \u2014 a controlled OOB write suitable for corrupting adjacent slab objects and hijacking control flow.\nA:H - A read 65520 bytes past a small kmalloc allocation reliably faults on unmapped memory or trips KASAN/KFENCE, and the `WARN_ON(!e)` in `indx_insert_into_root()` fires on the same corrupted pointer, so a single `stat()` on the crafted mount oopses or panics the kernel."
    }
  }
}