{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50246",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-50246"
  ],
  "published": "2024-11-09T10:15:51Z",
  "summary": "fs/ntfs3: Add rough attr alloc_size check",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: Add rough attr alloc_size check",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-50246"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/effac690913af9a6c3d6cd967281a34e47ed3e4c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e91fbb21f248bdd8140f343dac32b77b9bc10fec"
    },
    {
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      "url": "https://git.kernel.org/stable/c/2fcae4c2014a40c8ae0fc3d8cca3ba9e168308de"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c4a8ba334262e9a5c158d618a4820e1b9c12495c"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable parser only processes MFT records read from a mounted NTFS block device, reached via mount(2) and subsequent local filesystem operations, with no network-facing path. Attack Vector is therefore Local rather than Physical, since the attacker supplies the image data and does not need to touch the hardware themselves.\nAC:L - The attacker fully controls the on-disk `alloc_size` field in the crafted image, so the oversized-allocation path is triggered deterministically at mount time with no race, timing, or memory-layout dependency (syzbot has a reproducer). No conditions lie outside the attacker's control.\nPR:N - The attacker needs no account or privileges on the target system \u2014 they only need to hand over a malicious NTFS image or removable device, which is then mounted by an administrator or automatically by a desktop automounter such as udisks2. All parsing happens before any attacker credential is involved.\nUI:R - Some action on the victim's side is required to bring the crafted volume into the kernel \u2014 mounting the image, inserting the removable device, or opening a file on such a volume. The bug cannot fire without that step.\nS:U - The corruption and resource exhaustion are confined to the kernel of the machine performing the mount; no VM, IOMMU, or other security-authority boundary is crossed. This is a standard in-kernel filesystem parsing flaw.\nC:H - The unvalidated 64-bit `alloc_size` is truncated into 32-bit `CLST` bounds used as range guards in `attr_data_get_block()`, `attr_collapse_range()` and `attr_punch_hole()`, and inflates `sbi->mft.bitmap.nbits`, so attacker-chosen values defeat the bounds checks that keep cluster/MFT indexing in range and can expose kernel memory and out-of-range on-disk metadata.\nI:H - The same 64-bit-to-32-bit truncation and inflated MFT bitmap bounds let an attacker steer writes and MFT-extension arithmetic (`(u64)new_mft_total << record_bits`) outside the ranges the driver believes are valid, giving out-of-bounds indexing and filesystem-metadata corruption on a mounted read-write volume.\nA:H - The reported crash is a `WARN_ON_ONCE` splat from `kvmalloc_array()` in `wnd_init()` for an over-INT_MAX allocation, which is an immediate kernel panic on systems configured with `panic_on_warn`; tuned values instead force multi-hundred-megabyte to gigabyte kernel allocations and abort the mount, a reliable denial of service."
    }
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}