{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64323", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.780Z", "datePublished": "2026-07-25T08:49:51.097Z", "dateUpdated": "2026-07-25T08:49:51.097Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-25T08:49:51.097Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: validate VAT header length against the VAT inode size\n\nudf_load_vat() takes the virtual partition's start offset straight from\nthe on-disk VAT 2.0 header without checking it against the VAT inode\nsize:\n\n\tmap->s_type_specific.s_virtual.s_start_offset =\n\t\tle16_to_cpu(vat20->lengthHeader);\n\tmap->s_type_specific.s_virtual.s_num_entries =\n\t\t(sbi->s_vat_inode->i_size -\n\t\t\tmap->s_type_specific.s_virtual.s_start_offset) >> 2;\n\nlengthHeader is a fully attacker-controlled 16-bit value. If it exceeds\nthe VAT inode size, the s_num_entries subtraction underflows to a huge\ncount, which defeats the \"block > s_num_entries\" bound in\nudf_get_pblock_virt15(); and on the ICB-inline path that function reads\n\n\t((__le32 *)(iinfo->i_data + s_start_offset))[block]\n\nso a large s_start_offset indexes past the inode's in-ICB data. Mounting\na crafted UDF image with a virtual (VAT) partition then triggers an\nout-of-bounds read.\n\nReject a VAT whose header length does not leave room for at least one\nentry within the VAT inode."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/udf/super.c"], "versions": [{"version": "fa5e08156335d0687c85b4e724db9448fb166601", "lessThan": "0ad2d09a8d66fa8dc6f9b70d660b5fb4478ea934", "status": "affected", "versionType": "git"}, {"version": "fa5e08156335d0687c85b4e724db9448fb166601", "lessThan": "883962731420ec271ed8c1cd76524f4b17faa982", "status": "affected", "versionType": "git"}, {"version": "fa5e08156335d0687c85b4e724db9448fb166601", "lessThan": "2900e02a0dd4fc30ac9840e7ce4ca0b041ab0d63", "status": "affected", "versionType": "git"}, {"version": "fa5e08156335d0687c85b4e724db9448fb166601", "lessThan": "bb0d384c1f42a5b7ace0bd88fee80b9bb1d49acb", "status": "affected", "versionType": "git"}, {"version": "fa5e08156335d0687c85b4e724db9448fb166601", "lessThan": "55287a3555ff0515b3aff181d2c08c0462a41709", "status": "affected", "versionType": "git"}, {"version": "fa5e08156335d0687c85b4e724db9448fb166601", "lessThan": "e610fb113cdfa8bf4247c9bf4f2337b81ad4ddad", "status": "affected", "versionType": "git"}, {"version": "fa5e08156335d0687c85b4e724db9448fb166601", "lessThan": "74580fdf022909e184223cacc364feb826982d96", "status": "affected", "versionType": "git"}, {"version": "fa5e08156335d0687c85b4e724db9448fb166601", "lessThan": "d8202786b3d75125c84ebc4de6d946f92fde0ee8", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/udf/super.c"], "versions": [{"version": "2.6.26", "status": "affected"}, {"version": "0", "lessThan": "2.6.26", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.18.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "7.2-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0ad2d09a8d66fa8dc6f9b70d660b5fb4478ea934"}, {"url": "https://git.kernel.org/stable/c/883962731420ec271ed8c1cd76524f4b17faa982"}, {"url": "https://git.kernel.org/stable/c/2900e02a0dd4fc30ac9840e7ce4ca0b041ab0d63"}, {"url": "https://git.kernel.org/stable/c/bb0d384c1f42a5b7ace0bd88fee80b9bb1d49acb"}, {"url": "https://git.kernel.org/stable/c/55287a3555ff0515b3aff181d2c08c0462a41709"}, {"url": "https://git.kernel.org/stable/c/e610fb113cdfa8bf4247c9bf4f2337b81ad4ddad"}, {"url": "https://git.kernel.org/stable/c/74580fdf022909e184223cacc364feb826982d96"}, {"url": "https://git.kernel.org/stable/c/d8202786b3d75125c84ebc4de6d946f92fde0ee8"}], "title": "udf: validate VAT header length against the VAT inode size", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa5e08156335d0687c85b4e724db9448fb166601,0ad2d09a8d66fa8dc6f9b70d660b5fb4478ea934)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa5e08156335d0687c85b4e724db9448fb166601,883962731420ec271ed8c1cd76524f4b17faa982)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa5e08156335d0687c85b4e724db9448fb166601,2900e02a0dd4fc30ac9840e7ce4ca0b041ab0d63)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa5e08156335d0687c85b4e724db9448fb166601,55287a3555ff0515b3aff181d2c08c0462a41709)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa5e08156335d0687c85b4e724db9448fb166601,74580fdf022909e184223cacc364feb826982d96)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa5e08156335d0687c85b4e724db9448fb166601,e610fb113cdfa8bf4247c9bf4f2337b81ad4ddad)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa5e08156335d0687c85b4e724db9448fb166601,74580fdf022909e184223cacc364feb826982d96)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa5e08156335d0687c85b4e724db9448fb166601,d8202786b3d75125c84ebc4de6d946f92fde0ee8)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.26"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.26)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.96,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-25T13:00:05.593833+00:00", "updated": "2026-07-25T13:00:05.593900+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}