{"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": "2026-08-05T12:41:00.093Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:41:00.093Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable parser is reached by mounting a crafted local UDF image or removable volume; no network-facing protocol reaches it.\nAC:L - The VAT type, inline allocation, header length, and virtual block index are attacker-controlled on disk, with no race or uncontrollable condition required.\nPR:L - Although direct mounting requires init-namespace CAP_SYS_ADMIN, common UDisks/polkit deployments let an active unprivileged local user create a loop device and request the mount.\nUI:N - In the low-privilege UDisks scenario, the attacker can initiate the mount and trigger VAT resolution without another user's action.\nS:U - The vulnerable UDF parser and affected kernel resources remain within the host kernel's security authority.\nC:H - The underflow permits repeatable 32-bit reads at attacker-selected offsets potentially many gigabytes beyond the VAT buffer, enabling disclosure of kernel memory.\nI:N - The primitive only reads a mapping value, and virtual UDF partitions are forcibly read-only; no kernel-memory write primitive results.\nA:H - A sufficiently large attacker-selected index can fault in kernel context and cause an oops or panic, enabling repeatable system-wide denial of service."}]}], "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": [{"affectedData": [{"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": "0ad2d09a8d66fa8dc6f9b70d660b5fb4478ea934", "status": "affected", "version": "fa5e08156335d0687c85b4e724db9448fb166601", "versionType": "git"}, {"lessThan": "883962731420ec271ed8c1cd76524f4b17faa982", "status": "affected", "version": "fa5e08156335d0687c85b4e724db9448fb166601", "versionType": "git"}, {"lessThan": "2900e02a0dd4fc30ac9840e7ce4ca0b041ab0d63", "status": "affected", "version": "fa5e08156335d0687c85b4e724db9448fb166601", "versionType": "git"}, {"lessThan": "bb0d384c1f42a5b7ace0bd88fee80b9bb1d49acb", "status": "affected", "version": "fa5e08156335d0687c85b4e724db9448fb166601", "versionType": "git"}, {"lessThan": "55287a3555ff0515b3aff181d2c08c0462a41709", "status": "affected", "version": "fa5e08156335d0687c85b4e724db9448fb166601", "versionType": "git"}, {"lessThan": "e610fb113cdfa8bf4247c9bf4f2337b81ad4ddad", "status": "affected", "version": "fa5e08156335d0687c85b4e724db9448fb166601", "versionType": "git"}, {"lessThan": "74580fdf022909e184223cacc364feb826982d96", "status": "affected", "version": "fa5e08156335d0687c85b4e724db9448fb166601", "versionType": "git"}, {"lessThan": "d8202786b3d75125c84ebc4de6d946f92fde0ee8", "status": "affected", "version": "fa5e08156335d0687c85b4e724db9448fb166601", "versionType": "git"}]}, {"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": "2.6.26"}, {"lessThan": "2.6.26", "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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-64323", "lastModified": "2026-08-11T15:00:57.447", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-25T10:17:13.790", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0ad2d09a8d66fa8dc6f9b70d660b5fb4478ea934"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2900e02a0dd4fc30ac9840e7ce4ca0b041ab0d63"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/55287a3555ff0515b3aff181d2c08c0462a41709"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/74580fdf022909e184223cacc364feb826982d96"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/883962731420ec271ed8c1cd76524f4b17faa982"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bb0d384c1f42a5b7ace0bd88fee80b9bb1d49acb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d8202786b3d75125c84ebc4de6d946f92fde0ee8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e610fb113cdfa8bf4247c9bf4f2337b81ad4ddad"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: udf: validate VAT header length against the VAT inode size", "id": "2507054", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507054"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's Universal Disk Format (UDF) filesystem. A local attacker could craft a malicious UDF image with a specially formed Virtual Allocation Table (VAT) header. When this image is mounted, the kernel fails to properly validate the VAT header length against the VAT inode size. This can lead to an out-of-bounds read, potentially causing a system crash or information disclosure."], "name": "CVE-2026-64323", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "moderate", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64323\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64323\nhttps://lore.kernel.org/linux-cve-announce/2026072512-CVE-2026-64323-0fd2@gregkh/T"], "threat_severity": "Moderate"}

{"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": "2026-08-03T19:15:04.392445+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}