{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-46777",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-46777"
  ],
  "published": "2024-09-18T07:17:19Z",
  "summary": "udf: Avoid excessive partition lengths",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: Avoid excessive partition lengths\n\nAvoid mounting filesystems where the partition would overflow the\n32-bits used for block number. Also refuse to mount filesystems where\nthe partition length is so large we cannot safely index bits in a\nblock bitmap.",
  "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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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-46777"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c0c23130d38e8bc28e9ef581443de9b1fc749966"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1497a4484cdb2cf6c37960d788fb6ba67567bdb7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/551966371e17912564bc387fbeb2ac13077c3db1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2ddf831451357c6da4b64645eb797c93c1c054d1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0173999123082280cf904bd640015951f194a294"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a56330761950cb83de1dfb348479f20c56c95f90"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/925fd8ee80d5348a5e965548e5484d164d19221d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ebbe26fd54a9621994bc16b14f2ba8f84c089693"
    }
  ],
  "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 - Exploitation requires the attacker to get a crafted UDF filesystem image mounted on the target \u2014 via removable media on a kiosk/workstation or a loop-mounted image \u2014 which is local access, not network reachability.\nAC:L - The attacker fully controls every field of the on-disk Partition Descriptor and can set `partitionLength`/`partitionStartingLocation` to deterministic overflow-triggering values; no race or uncontrollable precondition is involved.\nPR:L - On typical desktop, kiosk and embedded systems udisks2/systemd automounts attacker-supplied UDF media on behalf of a local unprivileged user, so no elevated privileges are needed to get the malicious partition descriptor parsed.\nUI:N - Under the automount scenario the local attacker inserts the media and the mount plus subsequent allocation activity proceed without any separate victim action.\nS:U - The corruption is confined to kernel memory and the block device within the same security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The negative `block_group` yields an out-of-bounds read of `bitmap->s_block_bitmap[]` far past the allocation, and the 32-bit physical block wrap makes the filesystem read blocks outside the partition, exposing arbitrary on-device and kernel heap data.\nI:H - `read_block_bitmap()` performs an out-of-bounds pointer store into `s_block_bitmap[]` and the bogus `buffer_head` is then used for `udf_clear_bit()`/`udf_set_bit()` on `bh->b_data`, giving a controlled-offset heap write; the block-number wrap additionally lets file data overwrite blocks outside the partition.\nA:H - The wild-pointer dereference of the out-of-bounds `struct buffer_head *` reliably oopses the kernel, and the resulting heap and on-disk metadata corruption causes further crashes."
    }
  }
}