{"id":"CVE-2026-64322","revision":"b033c14d1e2944909e950f6e872a582b","records":[{"revision":"b033c14d1e2944909e950f6e872a582b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64322","aliases":[],"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":0,"publishedAt":"2026-07-25T08:49:50.18+00:00","modifiedAt":"2026-10-19T20:38:23.865+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/udf/super.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\n                            \"lessThan\": \"eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\n                            \"lessThan\": \"0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\n                            \"lessThan\": \"2d726135099313958f8975532a2e15322ff150ce\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\n                            \"lessThan\": \"7285276aa50d2839afb5957ffd491ad282dc8f72\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\n                            \"lessThan\": \"2a219acb2ce674d99bbd1b7b35ed8c384dac7200\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\n                            \"lessThan\": \"04f4599a9efb90992d072a814960edf0cd62805d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\n                            \"lessThan\": \"7f7774b9da0ef17b87bfa238cf966ad0b3376150\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"1df2ae31c724e57be9d7ac00d78db8a5dabdd050\",\n                            \"lessThan\": \"3ec997bd5508e9b25210b5bbec89031629cdb093\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e240873cb4a9fd18de60a817100a96fe670d4359\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9ae30e324a96d0328a575329d7a95a09b3318601\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b1c5701ad6b3e5d21d16f65475651cfaaa41e7aa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a9f1af04f086656246f30354fb4564ce3b08c4a0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4836ee563d65bb492f907cbe267a5761b9693e4d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2.6.32.60\",\n                            \"lessThan\": \"2.6.33\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"2.6.34.14\",\n                            \"lessThan\": \"2.6.35\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.0.37\",\n                            \"lessThan\": \"3.1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.2.23\",\n                            \"lessThan\": \"3.3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"3.4.5\",\n                            \"lessThan\": \"3.5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/udf/super.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.5\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.261\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.212\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.96\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.39\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.4\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/eeb0f3e193f8e523d03e4c9e084f6b4875f50e8e","https://git.kernel.org/stable/c/0a9b79a951cfd70a9d31ca01ae2d08a20bb730e9","https://git.kernel.org/stable/c/2d726135099313958f8975532a2e15322ff150ce","https://git.kernel.org/stable/c/7285276aa50d2839afb5957ffd491ad282dc8f72","https://git.kernel.org/stable/c/2a219acb2ce674d99bbd1b7b35ed8c384dac7200","https://git.kernel.org/stable/c/04f4599a9efb90992d072a814960edf0cd62805d","https://git.kernel.org/stable/c/7f7774b9da0ef17b87bfa238cf966ad0b3376150","https://git.kernel.org/stable/c/3ec997bd5508e9b25210b5bbec89031629cdb093"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64322","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64322","identifiers":["CVE-2026-64322"]},"retained":false,"historicalAffected":[]}],"coverage":[]}