{"api_version":"1","generated_at":"2026-08-18T11:35:08+00:00","cve":"CVE-2026-72206","urls":{"html":"https://cve.report/CVE-2026-72206","api":"https://cve.report/api/cve/CVE-2026-72206.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72206","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72206"},"summary":{"title":"ntfs: validate index block header more strictly","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: validate index block header more strictly\n\nModify ntfs_index_block_inconsisent() to perform stricter validation of\nINDEX_HEADER geometry in INDX blocks, and update\nntfs_lookup_inode_by_name() to use that function to validate INDX\nblocks.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:39","updated_at":"2026-08-18 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the Linux kernel, the following vulnerability has been resolved:\n\nntfs: validate index block header more strictly\n\nModify ntfs_index_block_inconsisent() to perform stricter validation of\nINDEX_HEADER geometry in INDX blocks, and update\nntfs_lookup_inode_by_name() to use that function to validate INDX\nblocks."}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - Legacy fs/ntfs registers ntfs_export_ops; remote nfsd/ksmbd LOOKUP or open/stat on an exported crafted NTFS volume reaches ntfs_lookup→ntfs_lookup_inode_by_name INDX B+tree descent without attacker local shell access.\nAC:L - The attacker fully controls on-disk INDX INDEX_HEADER geometry (entries_offset, index_length, allocated_size); pre-fix ntfs_lookup_inode_by_name omitted checks that ntfs_index_block_inconsistent enforced, enabling reliable malformed-index parsing with no race.\nPR:N - Exploitation needs only a malicious NTFS image (USB, loop, dual-boot) mounted by root/udisks2/automount, or NFS/SMB read access to exported paths; no init-namespace root or CAP_SYS_ADMIN on the lookup trigger path.\nUI:N - Automounting removable NTFS or fill_super lookups (e.g. into $Extend/Quota) invoke ntfs_lookup_inode_by_name against index-allocation blocks without further victim action beyond presenting the crafted volume.\nS:U - Out-of-bounds INDX parsing impacts only the host kernel within its filesystem security authority; this is not a VM escape, IOMMU bypass, or cross-sandbox boundary crossing.\nC:H - Missing entries_offset/index_length versus bytes_available validation lets lookup reinterpret INDX header bytes as index entries and read past the index area within the kmalloc page buffer into adjacent kernel memory.\nI:H - The same unchecked INDX geometry is parsed by ntfs_ib_read for write-capable index operations; attacker-steerable header/entry walks can feed later memmove/insert paths and heap corruption beyond the intended index buffer.\nA:H - Crafted INDX entries_offset/length fields can cause infinite index-entry loops, slab/page out-of-bounds reads on malformed walks, or unhandled faults that oops or panic the kernel during directory lookup or mount."}]}],"providerMetadata":{"dateUpdated":"2026-08-18T06:56:26.018Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/34a49b3e94a50f45b62c6e6f574f676a079ba23e"},{"url":"https://git.kernel.org/stable/c/14bc34fe948523dc2b0174691f9af9e74eb4f3fd"}],"title":"ntfs: validate index block header more 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blocks, and update\nntfs_lookup_inode_by_name() to use that function to validate INDX\nblocks.","Type":"Description","Title":"ntfs: validate index block header more strictly"}]}}}