{"api_version":"1","generated_at":"2026-08-18T11:35:15+00:00","cve":"CVE-2026-72204","urls":{"html":"https://cve.report/CVE-2026-72204","api":"https://cve.report/api/cve/CVE-2026-72204.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72204","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72204"},"summary":{"title":"ntfs: centalize $INDEX_ROOT header validation","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: centalize $INDEX_ROOT header validation\n\nAdd a dedicated helper to perform stricter validation of $INDEX_ROOT and\nuse it for both directory inodes and named index inodes. This keeps the\nroot size and header geometry checks consistent across both read paths.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:39","updated_at":"2026-08-18 07:16:53"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.4","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/b06730c6af58d3569883f8dd7c36a90aba5ecc0a","name":"https://git.kernel.org/stable/c/b06730c6af58d3569883f8dd7c36a90aba5ecc0a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8b97b302f553a480fb76d2afd53cd6c0635a9dcd","name":"https://git.kernel.org/stable/c/8b97b302f553a480fb76d2afd53cd6c0635a9dcd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72204","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72204","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0a8ac0c1fa0b99a5b29002bc7f232ed7eafddef0 b06730c6af58d3569883f8dd7c36a90aba5ecc0a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0a8ac0c1fa0b99a5b29002bc7f232ed7eafddef0 8b97b302f553a480fb76d2afd53cd6c0635a9dcd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72204","cve":"CVE-2026-72204","epss":"0.001680000","percentile":"0.064880000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/ntfs/index.c","fs/ntfs/index.h","fs/ntfs/inode.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b06730c6af58d3569883f8dd7c36a90aba5ecc0a","status":"affected","version":"0a8ac0c1fa0b99a5b29002bc7f232ed7eafddef0","versionType":"git"},{"lessThan":"8b97b302f553a480fb76d2afd53cd6c0635a9dcd","status":"affected","version":"0a8ac0c1fa0b99a5b29002bc7f232ed7eafddef0","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/ntfs/index.c","fs/ntfs/index.h","fs/ntfs/inode.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.1"},{"lessThan":"7.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"7.1","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: centalize $INDEX_ROOT header validation\n\nAdd a dedicated helper to perform stricter validation of $INDEX_ROOT and\nuse it for both directory inodes and named index inodes. This keeps the\nroot size and header geometry checks consistent across both read paths."}],"metrics":[{"cvssV3_1":{"baseScore":8.4,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached only when the legacy fs/ntfs driver parses a crafted $INDEX_ROOT during mount or local VFS inode load (ntfs_fill_super→ntfs_iget/ntfs_index_iget→ntfs_read_locked_inode or ntfs_read_locked_index_inode); there is no network-facing handler.\nAC:L - The attacker fully controls on-disk $INDEX_ROOT header geometry (value_length, entries_offset, index_length, allocated_size), so the missing checks and resulting out-of-bounds access in ntfs_lookup_inode_by_name are reliably triggerable with no race or uncontrollable layout dependency.\nPR:N - The attacker needs no account or capabilities on the victim—only a malicious NTFS image presented via USB, loop device, or dual-boot partition that root, udisks2, or automount loads on their behalf.\nUI:N - On kiosks, desktops, and automotive/embedded systems that automount removable NTFS media, inserting the device alone runs ntfs_fill_super and inode read of directory/index metadata with no further deliberate victim action beyond presenting the volume.\nS:U - Impact is confined to kernel heap parsing within the same OS security authority; this is not a VM escape, IOMMU bypass, or cross-sandbox boundary crossing.\nC:H - Without full header validation, crafted entries_offset/index_length pairs let ntfs_lookup_inode_by_name and inode-read paths read past the resident $INDEX_ROOT value into adjacent kmalloc MFT/slab memory, enabling unbounded kernel information disclosure.\nI:H - The same unchecked header fields drive index entry walks and later RW index memmove/insert paths on a writable mount; attacker-controlled geometry can corrupt heap metadata beyond the resident value, yielding a write primitive suitable for privilege escalation.\nA:H - Out-of-bounds reads of index entries and header fields from malformed $INDEX_ROOT during mount or directory access can fault on unmapped memory and oops/panic the kernel, fully denying availability."}]}],"providerMetadata":{"dateUpdated":"2026-08-18T06:56:23.160Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b06730c6af58d3569883f8dd7c36a90aba5ecc0a"},{"url":"https://git.kernel.org/stable/c/8b97b302f553a480fb76d2afd53cd6c0635a9dcd"}],"title":"ntfs: centalize $INDEX_ROOT header validation","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72204","datePublished":"2026-08-15T05:54:01.070Z","dateReserved":"2026-08-09T03:40:39.912Z","dateUpdated":"2026-08-18T06:56:23.160Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:39","lastModifiedDate":"2026-08-18 07:16:53","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:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72204","Ordinal":"1","Title":"ntfs: centalize $INDEX_ROOT header validation","CVE":"CVE-2026-72204","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72204","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: centalize $INDEX_ROOT header validation\n\nAdd a dedicated helper to perform stricter validation of $INDEX_ROOT and\nuse it for both directory inodes and named index inodes. This keeps the\nroot size and header geometry checks consistent across both read paths.","Type":"Description","Title":"ntfs: centalize $INDEX_ROOT header validation"}]}}}