{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-72206",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-09T03:40:39.912Z",
        "datePublished": "2026-08-15T05:54:02.534Z",
        "dateUpdated": "2026-08-18T06:56:26.018Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-18T06:56:26.018Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 9.8,
                        "baseSeverity": "CRITICAL"
                    },
                    "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."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ntfs/dir.c",
                        "fs/ntfs/index.c",
                        "fs/ntfs/index.h"
                    ],
                    "versions": [
                        {
                            "version": "1e9ea7e04472d4e5e12e58c881eaacfb3e49b669",
                            "lessThan": "34a49b3e94a50f45b62c6e6f574f676a079ba23e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1e9ea7e04472d4e5e12e58c881eaacfb3e49b669",
                            "lessThan": "14bc34fe948523dc2b0174691f9af9e74eb4f3fd",
                            "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/ntfs/dir.c",
                        "fs/ntfs/index.c",
                        "fs/ntfs/index.h"
                    ],
                    "versions": [
                        {
                            "version": "7.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.5",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "7.1",
                                    "versionEndExcluding": "7.1.5"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.1",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/34a49b3e94a50f45b62c6e6f574f676a079ba23e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/14bc34fe948523dc2b0174691f9af9e74eb4f3fd"
                }
            ],
            "title": "ntfs: validate index block header more strictly",
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                "engine": "bippy-1.2.0"
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}