{"api_version":"1","generated_at":"2026-08-07T01:05:32+00:00","cve":"CVE-2026-64322","urls":{"html":"https://cve.report/CVE-2026-64322","api":"https://cve.report/api/cve/CVE-2026-64322.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64322","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64322"},"summary":{"title":"udf: validate sparing table length as an entry count, not a byte count","description":"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->reallocationTableLen) > sb->s_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 < le16_to_cpu(st->reallocationTableLen); i++) {\n\t\tstruct sparingEntry *entry = &st->mapEntry[i];\n\t\t... entry->origLocation ...\n\t}\n\nin udf_get_pblock_spar15() and udf_relocate_blocks().  A\nreallocationTableLen of N therefore passes the check whenever\nsizeof(*st) + N <= 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->mapEntry[] is an out-of-bounds\nwrite.\n\nValidate reallocationTableLen as the entry count it is, with\nstruct_size().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:13","updated_at":"2026-07-27 05:16:42"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce","name":"https://git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72","name":"https://git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2a219acb2ce674d99bbd1b7b35ed8c384dac7200","name":"https://git.kernel.org/stable/c/2a219acb2ce674d99bbd1b7b35ed8c384dac7200","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150","name":"https://git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e","name":"https://git.kernel.org/stable/c/eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d","name":"https://git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9","name":"https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093","name":"https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64322","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64322","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 2d726135099313958f8975532a2e15322ff150ce git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 7285276aa50d2839afb5957ffd491ad282dc8f72 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 2a219acb2ce674d99bbd1b7b35ed8c384dac7200 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 04f4599a9efb90992d072a814960edf0cd62805d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 7f7774b9da0ef17b87bfa238cf966ad0b3376150 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1df2ae31c724e57be9d7ac00d78db8a5dabdd050 3ec997bd5508e9b25210b5bbec89031629cdb093 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e240873cb4a9fd18de60a817100a96fe670d4359 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9ae30e324a96d0328a575329d7a95a09b3318601 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b1c5701ad6b3e5d21d16f65475651cfaaa41e7aa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a9f1af04f086656246f30354fb4564ce3b08c4a0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4836ee563d65bb492f907cbe267a5761b9693e4d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.32.60 2.6.33 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.34.14 2.6.35 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.0.37 3.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.2.23 3.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.4.5 3.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.5","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.261 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64322","cve":"CVE-2026-64322","epss":"0.001640000","percentile":"0.060280000","score_date":"2026-07-29","updated_at":"2026-07-30 00:09:16"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/udf/super.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e","status":"affected","version":"1df2ae31c724e57be9d7ac00d78db8a5dabdd050","versionType":"git"},{"lessThan":"0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9","status":"affected","version":"1df2ae31c724e57be9d7ac00d78db8a5dabdd050","versionType":"git"},{"lessThan":"2d726135099313958f8975532a2e15322ff150ce","status":"affected","version":"1df2ae31c724e57be9d7ac00d78db8a5dabdd050","versionType":"git"},{"lessThan":"7285276aa50d2839afb5957ffd491ad282dc8f72","status":"affected","version":"1df2ae31c724e57be9d7ac00d78db8a5dabdd050","versionType":"git"},{"lessThan":"2a219acb2ce674d99bbd1b7b35ed8c384dac7200","status":"affected","version":"1df2ae31c724e57be9d7ac00d78db8a5dabdd050","versionType":"git"},{"lessThan":"04f4599a9efb90992d072a814960edf0cd62805d","status":"affected","version":"1df2ae31c724e57be9d7ac00d78db8a5dabdd050","versionType":"git"},{"lessThan":"7f7774b9da0ef17b87bfa238cf966ad0b3376150","status":"affected","version":"1df2ae31c724e57be9d7ac00d78db8a5dabdd050","versionType":"git"},{"lessThan":"3ec997bd5508e9b25210b5bbec89031629cdb093","status":"affected","version":"1df2ae31c724e57be9d7ac00d78db8a5dabdd050","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"},{"lessThan":"2.6.33","status":"affected","version":"2.6.32.60","versionType":"semver"},{"lessThan":"2.6.35","status":"affected","version":"2.6.34.14","versionType":"semver"},{"lessThan":"3.1","status":"affected","version":"3.0.37","versionType":"semver"},{"lessThan":"3.3","status":"affected","version":"3.2.23","versionType":"semver"},{"lessThan":"3.5","status":"affected","version":"3.4.5","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/udf/super.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.5"},{"lessThan":"3.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32.60","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.34.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.0.37","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.2.23","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.4.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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->reallocationTableLen) > sb->s_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 < le16_to_cpu(st->reallocationTableLen); i++) {\n\t\tstruct sparingEntry *entry = &st->mapEntry[i];\n\t\t... entry->origLocation ...\n\t}\n\nin udf_get_pblock_spar15() and udf_relocate_blocks().  A\nreallocationTableLen of N therefore passes the check whenever\nsizeof(*st) + N <= 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->mapEntry[] is an out-of-bounds\nwrite.\n\nValidate reallocationTableLen as the entry count it is, with\nstruct_size()."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-27T04:59:48.014Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"udf: validate sparing table length as an entry count, not a byte count","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","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"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:13","lastModifiedDate":"2026-07-27 05:16:42","problem_types":[],"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}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64322","Ordinal":"1","Title":"udf: validate sparing table length as an entry count, not a byte","CVE":"CVE-2026-64322","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64322","Ordinal":"1","NoteData":"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->reallocationTableLen) > sb->s_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 < le16_to_cpu(st->reallocationTableLen); i++) {\n\t\tstruct sparingEntry *entry = &st->mapEntry[i];\n\t\t... entry->origLocation ...\n\t}\n\nin udf_get_pblock_spar15() and udf_relocate_blocks().  A\nreallocationTableLen of N therefore passes the check whenever\nsizeof(*st) + N <= 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->mapEntry[] is an out-of-bounds\nwrite.\n\nValidate reallocationTableLen as the entry count it is, with\nstruct_size().","Type":"Description","Title":"udf: validate sparing table length as an entry count, not a byte"}]}}}