CVE-2026-64322 (GCVE-0-2026-64322)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-27 04:59
VLAI
Title
udf: validate sparing table length as an entry count, not a byte count
Summary
In the Linux kernel, the following vulnerability has been resolved: udf: validate sparing table length as an entry count, not a byte count udf_load_sparable_map() accepts a sparing table when sizeof(*st) + le16_to_cpu(st->reallocationTableLen) > sb->s_blocksize is false, i.e. it treats reallocationTableLen as a number of BYTES that must fit in the block. But the table is walked as an array of 8-byte sparingEntry elements: for (i = 0; i < le16_to_cpu(st->reallocationTableLen); i++) { struct sparingEntry *entry = &st->mapEntry[i]; ... entry->origLocation ... } in udf_get_pblock_spar15() and udf_relocate_blocks(). A reallocationTableLen of N therefore passes the check whenever sizeof(*st) + N <= blocksize, yet the consumers index sizeof(*st) + N * sizeof(struct sparingEntry) bytes -- up to ~8x the block. On a crafted UDF image this is an out-of-bounds read in udf_get_pblock_spar15(); udf_relocate_blocks() additionally feeds the same length to udf_update_tag(), whose crc_itu_t() reads far past the block, and its memmove() through st->mapEntry[] is an out-of-bounds write. Validate reallocationTableLen as the entry count it is, with struct_size().
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
Linux Linux Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e (git)
Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9 (git)
Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 2d726135099313958f8975532a2e15322ff150ce (git)
Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 7285276aa50d2839afb5957ffd491ad282dc8f72 (git)
Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 2a219acb2ce674d99bbd1b7b35ed8c384dac7200 (git)
Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 04f4599a9efb90992d072a814960edf0cd62805d (git)
Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 7f7774b9da0ef17b87bfa238cf966ad0b3376150 (git)
Affected: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 , < 3ec997bd5508e9b25210b5bbec89031629cdb093 (git)
Affected: e240873cb4a9fd18de60a817100a96fe670d4359 (git)
Affected: 9ae30e324a96d0328a575329d7a95a09b3318601 (git)
Affected: b1c5701ad6b3e5d21d16f65475651cfaaa41e7aa (git)
Affected: a9f1af04f086656246f30354fb4564ce3b08c4a0 (git)
Affected: 4836ee563d65bb492f907cbe267a5761b9693e4d (git)
Affected: 2.6.32.60 , < 2.6.33 (semver)
Affected: 2.6.34.14 , < 2.6.35 (semver)
Affected: 3.0.37 , < 3.1 (semver)
Affected: 3.2.23 , < 3.3 (semver)
Affected: 3.4.5 , < 3.5 (semver)
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Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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          "value": "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()."
        }
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            "version": "3.1"
          }
        }
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        "dateUpdated": "2026-07-27T04:59:48.014Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9"
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          "url": "https://git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce"
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          "url": "https://git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72"
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        {
          "url": "https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093"
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      "title": "udf: validate sparing table length as an entry count, not a byte count",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64322",
    "datePublished": "2026-07-25T08:49:50.180Z",
    "dateReserved": "2026-07-19T15:36:31.780Z",
    "dateUpdated": "2026-07-27T04:59:48.014Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64322",
      "date": "2026-07-27",
      "epss": "0.00164",
      "percentile": "0.06011"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-26T01:11:19.000Z",
      "cve": "CVE-2026-64322",
      "id": "msrc_CVE-2026-64322",
      "initial_release_date": "2026-07-26T01:11:19.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "udf: validate sparing table length as an entry count, not a byte count",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64322.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64322\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:13.640\",\"lastModified\":\"2026-07-27T05:16:42.210\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/udf/super.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\"lessThan\":\"eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\"lessThan\":\"0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\"lessThan\":\"2d726135099313958f8975532a2e15322ff150ce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\"lessThan\":\"7285276aa50d2839afb5957ffd491ad282dc8f72\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\"lessThan\":\"2a219acb2ce674d99bbd1b7b35ed8c384dac7200\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\"lessThan\":\"04f4599a9efb90992d072a814960edf0cd62805d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\"lessThan\":\"7f7774b9da0ef17b87bfa238cf966ad0b3376150\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\"lessThan\":\"3ec997bd5508e9b25210b5bbec89031629cdb093\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e240873cb4a9fd18de60a817100a96fe670d4359\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9ae30e324a96d0328a575329d7a95a09b3318601\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b1c5701ad6b3e5d21d16f65475651cfaaa41e7aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a9f1af04f086656246f30354fb4564ce3b08c4a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4836ee563d65bb492f907cbe267a5761b9693e4d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2.6.32.60\",\"lessThan\":\"2.6.33\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"2.6.34.14\",\"lessThan\":\"2.6.35\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.0.37\",\"lessThan\":\"3.1\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.2.23\",\"lessThan\":\"3.3\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.4.5\",\"lessThan\":\"3.5\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/udf/super.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.5\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2a219acb2ce674d99bbd1b7b35ed8c384dac7200\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:45:45Z",
      "cve": "CVE-2026-64322",
      "id": "CVE-2026-64322",
      "initial_release_date": "2026-07-25T16:45:45Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64322",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64322.json",
      "version": "2"
    }
  }
}



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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.