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CVE-2026-45991 (GCVE-0-2026-45991)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:55 – Updated: 2026-08-05 12:29
VLAI
Title
udf: fix partition descriptor append bookkeeping
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ee4af50ca94f58afc3532662779b9cf80bbe27c8 , < ad3c0c4400686f6f37b382aaa48fac2b9aefccbe (git)
Affected: ee4af50ca94f58afc3532662779b9cf80bbe27c8 , < 68013a9bd4c01acd42073715f00e1a1992f089ee (git)
Affected: ee4af50ca94f58afc3532662779b9cf80bbe27c8 , < e8474cfbac9ada2cdaa4eaedec22aadfa0f58559 (git)
Affected: ee4af50ca94f58afc3532662779b9cf80bbe27c8 , < 058b451b1039f056d1362c4fec2229e522366ab0 (git)
Affected: ee4af50ca94f58afc3532662779b9cf80bbe27c8 , < b5597bb83fc37b5b5da74a4453fa920b932cf39a (git)
Affected: ee4af50ca94f58afc3532662779b9cf80bbe27c8 , < 08fa5d818e5bf53c7ca234d88ba334f32004e9b6 (git)
Affected: ee4af50ca94f58afc3532662779b9cf80bbe27c8 , < 08841b06fa64d8edbd1a21ca6e613420c90cc4b8 (git)
Affected: 7f401f160a9c7a1ff84ba3cb9b2f636d1f5cfb6b (git)
Affected: 4.18.7 , < 4.19 (semver)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T08:12:03+00:00",
      "cve": "CVE-2026-45991",
      "id": "CVE-2026-45991",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "28",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: udf: fix partition descriptor append bookkeeping",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45991.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:13:38Z",
      "cve": "CVE-2026-45991",
      "id": "CVE-2026-45991",
      "initial_release_date": "2026-05-28T03:54:48Z",
      "product_status:known_affected": "262",
      "product_status:known_not_affected": "125",
      "product_status:recommended": "106",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45991",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45991.json",
      "version": "10"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.