{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72200", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.911Z", "datePublished": "2026-08-15T05:53:58.100Z", "dateUpdated": "2026-10-30T12:28:55.485Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:28:55.485Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: detect mapping-pairs LCN accumulator overflow\n\nThe NTFS mapping-pairs parser accumulates relative LCN deltas in a\nsigned integer. A corrupted attribute can drive that addition past\nthe representable range.\n\nOne corrupt runlist shape sets the accumulated LCN to S64_MAX and\nthen adds a delta of 1 in the next mapping-pairs entry.\n\nSigned overflow is undefined and can turn an invalid runlist into a\ndifferent set of physical clusters.\n\nCheck the LCN addition for overflow before storing the next run." } ], "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 NTFS is NFS-exportable (ntfs_export_ops) and commonly served via ksmbd; remote SMB/NFS reads on an exported NTFS mount reach ntfs_mapping_pairs_decompress() through VFS read/iomap and ntfs_map_runlist() without local shell access.\nAC:L - An attacker fully controls crafted on-disk mapping pairs offline (e.g., drive LCN to S64_MAX then add +1) and can reliably trigger decompression on mount or the next attribute access that maps the runlist; no races or victim-specific layout are required.\nPR:N - Triggering decompression needs only permission to cause server-side parsing of mounted NTFS metadata (e.g., guest/anonymous SMB or permissive NFS read, or unprivileged local open/read on an already-mounted volume), not init-namespace root or CAP_SYS_ADMIN at trigger time.\nUI:N - After the volume is mounted/exported, exploitation requires only normal remote or local filesystem read/open operations on files whose non-resident attributes carry the poisoned mapping pairs; no additional victim mount dialogs, USB insertion, or other user actions are needed during the attack.\nS:U - Impact stays within the kernel/host context (runlist corruption and misdirected block I/O on the mounted volume); it does not cross a VM, container, or IOMMU boundary to another security authority.\nC:H - Signed LCN accumulator overflow (undefined behavior) yields attacker-controlled cluster mappings, so subsequent reads can be directed to arbitrary on-volume clusters and disclose other files' data and metadata beyond the accessed object.\nI:H - Corrupted LCN values misdirect kernel writeback and allocation I/O to arbitrary physical clusters on the volume, enabling cross-file/metadata tampering and further corruption exploitable for broader integrity compromise.\nA:H - Misdirected cluster I/O and corrupt runlists cause mount/read/write failures, can destroy critical structures like $MFT, and repeated remote access can deny service to the host or exported filesystem." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs/runlist.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b06b4fc2138ded8ee0b3dc602991ff6dbb10dd0a", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6626fb859f4c4772f2f59751d23937716e03f98f", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89", "status": "affected", "versionType": "git" }, { "version": "1e9ea7e04472d4e5e12e58c881eaacfb3e49b669", "lessThan": "7fb64788812d137b37f6d8724e1e41c624c1e814", "status": "affected", "versionType": "git" }, { "version": "1e9ea7e04472d4e5e12e58c881eaacfb3e49b669", "lessThan": "ec4f061f2219e0f0c6465d56d0380bf749235a53", "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/runlist.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "7.1", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "2.6.12", "versionEndExcluding": "6.1.191" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.9" }, { "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/b06b4fc2138ded8ee0b3dc602991ff6dbb10dd0a" }, { "url": "https://git.kernel.org/stable/c/6626fb859f4c4772f2f59751d23937716e03f98f" }, { "url": "https://git.kernel.org/stable/c/7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89" }, { "url": "https://git.kernel.org/stable/c/7fb64788812d137b37f6d8724e1e41c624c1e814" }, { "url": "https://git.kernel.org/stable/c/ec4f061f2219e0f0c6465d56d0380bf749235a53" } ], "title": "ntfs: detect mapping-pairs LCN accumulator overflow", "x_generator": { "engine": "bippy-1.2.0" } } } }