CVE-2026-64322 (GCVE-0-2026-64322)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-10-19 20:38
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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().
References
Impacted products
Vendor Product Version
Linux Linux Version: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050
Version: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050
Version: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050
Version: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050
Version: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050
Version: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050
Version: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050
Version: 1df2ae31c724e57be9d7ac00d78db8a5dabdd050
Version: e240873cb4a9fd18de60a817100a96fe670d4359
Version: 9ae30e324a96d0328a575329d7a95a09b3318601
Version: b1c5701ad6b3e5d21d16f65475651cfaaa41e7aa
Version: a9f1af04f086656246f30354fb4564ce3b08c4a0
Version: 4836ee563d65bb492f907cbe267a5761b9693e4d
Version: 2.6.32.60   ≤
Version: 2.6.34.14   ≤
Version: 3.0.37   ≤
Version: 3.2.23   ≤
Version: 3.4.5   ≤
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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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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9"
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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": "2026-10-19T20:38:23.865Z",
    "state": "PUBLISHED"
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through copied entries or returned mapping values.\\nI:H - udf_relocate_blocks performs an out-of-bounds origLocation store and attacker-sized memmove through mapEntry[], potentially corrupting adjacent kernel pages and enabling control-flow hijacking.\\nA:H - The extensive out-of-bounds reads and writes can reliably cause a kernel oops, panic, or fatal memory corruption.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"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\"}], \"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\": \"3.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.96\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/udf/super.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e\"}, {\"url\": \"https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9\"}, {\"url\": \"https://git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce\"}, {\"url\": \"https://git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72\"}, {\"url\": \"https://git.kernel.org/stable/c/2a219acb2ce674d99bbd1b7b35ed8c384dac7200\"}, {\"url\": \"https://git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d\"}, {\"url\": \"https://git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150\"}, {\"url\": \"https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.96\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.39\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.4\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"2.6.32.60\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"2.6.34.14\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.0.37\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.2.23\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.4.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:53:23.900Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64322\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:38:23.865Z\", \"dateReserved\": \"2026-07-19T15:36:31.780Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-25T08:49:50.180Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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