{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1df2ae31c724e57be9d7ac00d78db8a5dabdd050"
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              "fixed": "7285276aa50d2839afb5957ffd491ad282dc8f72"
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              "fixed": "04f4599a9efb90992d072a814960edf0cd62805d"
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              "fixed": "7f7774b9da0ef17b87bfa238cf966ad0b3376150"
            },
            {
              "fixed": "3ec997bd5508e9b25210b5bbec89031629cdb093"
            }
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
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              "introduced": "0"
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              "last_affected": "e240873cb4a9fd18de60a817100a96fe670d4359"
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            {
              "last_affected": "a9f1af04f086656246f30354fb4564ce3b08c4a0"
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              "last_affected": "4836ee563d65bb492f907cbe267a5761b9693e4d"
            }
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
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              "introduced": "3.0.37"
            },
            {
              "fixed": "3.1"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
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            },
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            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
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              "introduced": "3.4.5"
            },
            {
              "fixed": "3.5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.5.0"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64322.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: validate sparing table length as an entry count, not a byte count\n\nudf_load_sparable_map() accepts a sparing table when\n\n\tsizeof(*st) + le16_to_cpu(st-\u003ereallocationTableLen) \u003e sb-\u003es_blocksize\n\nis false, i.e. it treats reallocationTableLen as a number of BYTES that\nmust fit in the block.  But the table is walked as an array of 8-byte\nsparingEntry elements:\n\n\tfor (i = 0; i \u003c le16_to_cpu(st-\u003ereallocationTableLen); i++) {\n\t\tstruct sparingEntry *entry = \u0026st-\u003emapEntry[i];\n\t\t... entry-\u003eorigLocation ...\n\t}\n\nin udf_get_pblock_spar15() and udf_relocate_blocks().  A\nreallocationTableLen of N therefore passes the check whenever\nsizeof(*st) + N \u003c= blocksize, yet the consumers index\nsizeof(*st) + N * sizeof(struct sparingEntry) bytes -- up to ~8x the\nblock.  On a crafted UDF image this is an out-of-bounds read in\nudf_get_pblock_spar15(); udf_relocate_blocks() additionally feeds the\nsame length to udf_update_tag(), whose crc_itu_t() reads far past the\nblock, and its memmove() through st-\u003emapEntry[] is an out-of-bounds\nwrite.\n\nValidate reallocationTableLen as the entry count it is, with\nstruct_size().",
  "id": "CVE-2026-64322",
  "modified": "2026-07-28T03:55:42.837337581Z",
  "published": "2026-07-25T08:49:50.180Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a219acb2ce674d99bbd1b7b35ed8c384dac7200"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64322.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64322"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "udf: validate sparing table length as an entry count, not a byte count"
}