CVE-2026-89525 (GCVE-0-2026-89525)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:48
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: udf: reject VAT indexes equal to the entry count UDF 1.50 virtual partition mapping uses the VAT as an array of physical block mappings. s_num_entries stores the number of entries in that array, not the highest valid index. The valid VAT indexes are therefore below s_num_entries. udf_get_pblock_virt15() currently rejects only indexes greater than s_num_entries. A crafted image can request index s_num_entries, pass the bounds check, and make the kernel read one entry past the allocated VAT table. Change the check to reject block >= s_num_entries, so the count is handled as an exclusive upper bound. A crafted UDF image reproduced this on origin/master commit 0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 with a KASAN slab-out-of-bounds report in udf_get_pblock_virt15(). Trail of Bits has a reproducer that triggers kernel panic demonstrating the bug, and can share it if needed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/udf/partition.c"
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          "vendor": "Linux",
          "versions": [
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            },
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "5.10.270",
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            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
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            },
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              "status": "unaffected",
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              "version": "7.2.4",
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: reject VAT indexes equal to the entry count\n\nUDF 1.50 virtual partition mapping uses the VAT as an array of physical\nblock mappings. s_num_entries stores the number of entries in that array,\nnot the highest valid index. The valid VAT indexes are therefore below\ns_num_entries.\n\nudf_get_pblock_virt15() currently rejects only indexes greater than\ns_num_entries. A crafted image can request index s_num_entries, pass the\nbounds check, and make the kernel read one entry past the allocated VAT table.\n\nChange the check to reject block \u003e= s_num_entries, so the count is handled as\nan exclusive upper bound.\n\nA crafted UDF image reproduced this on origin/master commit\n0e35b9b6ec0ffcc5e23cbdec09f5c622ad532b53 with a KASAN slab-out-of-bounds\nreport in udf_get_pblock_virt15().\n\nTrail of Bits has a reproducer that triggers kernel panic demonstrating the bug, and can share it if needed."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:48:16.507Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f64e01a90326bb85a3cc8aa0199931dc2f15b589"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a8c1c42a34349a0626d910abbad5a29136446b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4"
        },
        {
          "url": "https://git.kernel.org/stable/c/b77b83f5529a26d084d64ece98abd6f0cc86e053"
        },
        {
          "url": "https://git.kernel.org/stable/c/9193368408d792cec2057628d87862140fb1ce1c"
        },
        {
          "url": "https://git.kernel.org/stable/c/b95c33a4e743874f1b0a45bf2aaa4da553552bd1"
        },
        {
          "url": "https://git.kernel.org/stable/c/1bd7947f1463c21edafa256d0fbec5b99215e2b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/cac0cb07f29ccfb373fd4a36c81e908ef3ce608c"
        }
      ],
      "title": "udf: reject VAT indexes equal to the entry count",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89525",
    "datePublished": "2026-09-11T19:44:06.296Z",
    "dateReserved": "2026-09-11T19:38:34.719Z",
    "dateUpdated": "2026-10-19T08:48:16.507Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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