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udf: fix partition descriptor append bookkeeping

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-45991

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-45991

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "ee4af50ca94f58afc3532662779b9cf80bbe27c8",
        "lessThan": "ad3c0c4400686f6f37b382aaa48fac2b9aefccbe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee4af50ca94f58afc3532662779b9cf80bbe27c8",
        "lessThan": "68013a9bd4c01acd42073715f00e1a1992f089ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee4af50ca94f58afc3532662779b9cf80bbe27c8",
        "lessThan": "e8474cfbac9ada2cdaa4eaedec22aadfa0f58559",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee4af50ca94f58afc3532662779b9cf80bbe27c8",
        "lessThan": "058b451b1039f056d1362c4fec2229e522366ab0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee4af50ca94f58afc3532662779b9cf80bbe27c8",
        "lessThan": "b5597bb83fc37b5b5da74a4453fa920b932cf39a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee4af50ca94f58afc3532662779b9cf80bbe27c8",
        "lessThan": "73df74544b55241dca5dd788523e6f5f10bd2b9b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee4af50ca94f58afc3532662779b9cf80bbe27c8",
        "lessThan": "08fa5d818e5bf53c7ca234d88ba334f32004e9b6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ee4af50ca94f58afc3532662779b9cf80bbe27c8",
        "lessThan": "08841b06fa64d8edbd1a21ca6e613420c90cc4b8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7f401f160a9c7a1ff84ba3cb9b2f636d1f5cfb6b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4.18.7",
        "lessThan": "4.19",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "fs/udf/super.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.88",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.57",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/udf/super.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-45991

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40103 · Revision 1
Added to Heist Feed
Publisher date
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