{"id":"CVE-2026-72200","state":"PUBLISHED","title":"ntfs: detect mapping-pairs LCN accumulator overflow","description":"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.","publishedAt":"2026-08-15T05:53:58.100Z","updatedAt":"2026-10-30T12:28:55.485Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"b06b4fc2138ded8ee0b3dc602991ff6dbb10dd0a","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"6626fb859f4c4772f2f59751d23937716e03f98f","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89","versionType":"git"},{"version":"1e9ea7e04472d4e5e12e58c881eaacfb3e49b669","status":"affected","lessThan":"7fb64788812d137b37f6d8724e1e41c624c1e814","versionType":"git"},{"version":"1e9ea7e04472d4e5e12e58c881eaacfb3e49b669","status":"affected","lessThan":"ec4f061f2219e0f0c6465d56d0380bf749235a53","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs/runlist.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"7.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThan":"7.1","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs/runlist.c"]}],"references":["https://git.kernel.org/stable/c/b06b4fc2138ded8ee0b3dc602991ff6dbb10dd0a","https://git.kernel.org/stable/c/6626fb859f4c4772f2f59751d23937716e03f98f","https://git.kernel.org/stable/c/7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89","https://git.kernel.org/stable/c/7fb64788812d137b37f6d8724e1e41c624c1e814","https://git.kernel.org/stable/c/ec4f061f2219e0f0c6465d56d0380bf749235a53"],"weaknesses":[],"ingestedAt":"2026-10-30T12:48:04.825Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72200.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72200","state":"PUBLISHED","datePublished":"2026-08-15T05:53:58.100Z","dateUpdated":"2026-10-30T12:28:55.485Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.911Z"},"containers":{"cna":{"title":"ntfs: detect mapping-pairs LCN accumulator overflow","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"b06b4fc2138ded8ee0b3dc602991ff6dbb10dd0a","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"6626fb859f4c4772f2f59751d23937716e03f98f","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"7ffa8f3d30236e0ab897c30bdb01224ff1fe1c89","versionType":"git"},{"version":"1e9ea7e04472d4e5e12e58c881eaacfb3e49b669","status":"affected","lessThan":"7fb64788812d137b37f6d8724e1e41c624c1e814","versionType":"git"},{"version":"1e9ea7e04472d4e5e12e58c881eaacfb3e49b669","status":"affected","lessThan":"ec4f061f2219e0f0c6465d56d0380bf749235a53","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs/runlist.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"7.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThan":"7.1","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs/runlist.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:28:55.485Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}