FKIE_CVE-2026-45991

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-27 14:48
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: udf: fix partition descriptor append bookkeeping Mounting a crafted UDF image with repeated partition descriptors can trigger a heap out-of-bounds write in part_descs_loc[]. handle_partition_descriptor() deduplicates entries by partition number, but appended slots never record partnum. As a result duplicate Partition Descriptors are appended repeatedly and num_part_descs keeps growing. Once the table is full, the growth path still sizes the allocation from partnum even though inserts are indexed by num_part_descs. If partnum is already aligned to PART_DESC_ALLOC_STEP, ALIGN(partnum, step) can keep the old capacity and the next append writes past the end of the table. Store partnum in the appended slot and size growth from the next append count so deduplication and capacity tracking follow the same model.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/058b451b1039f056d1362c4fec2229e522366ab0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/08841b06fa64d8edbd1a21ca6e613420c90cc4b8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/08fa5d818e5bf53c7ca234d88ba334f32004e9b6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b5597bb83fc37b5b5da74a4453fa920b932cf39a
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: fix partition descriptor append bookkeeping\n\nMounting a crafted UDF image with repeated partition descriptors can\ntrigger a heap out-of-bounds write in part_descs_loc[].\n\nhandle_partition_descriptor() deduplicates entries by partition number,\nbut appended slots never record partnum. As a result duplicate\nPartition Descriptors are appended repeatedly and num_part_descs keeps\ngrowing.\n\nOnce the table is full, the growth path still sizes the allocation from\npartnum even though inserts are indexed by num_part_descs. If partnum is\nalready aligned to PART_DESC_ALLOC_STEP, ALIGN(partnum, step) can keep\nthe old capacity and the next append writes past the end of the table.\n\nStore partnum in the appended slot and size growth from the next append\ncount so deduplication and capacity tracking follow the same model."
    }
  ],
  "id": "CVE-2026-45991",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:16.643",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/058b451b1039f056d1362c4fec2229e522366ab0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/08841b06fa64d8edbd1a21ca6e613420c90cc4b8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/08fa5d818e5bf53c7ca234d88ba334f32004e9b6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b5597bb83fc37b5b5da74a4453fa920b932cf39a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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