{"api_version":"1","generated_at":"2026-08-18T11:35:56+00:00","cve":"CVE-2026-72210","urls":{"html":"https://cve.report/CVE-2026-72210","api":"https://cve.report/api/cve/CVE-2026-72210.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72210","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72210"},"summary":{"title":"ntfs: fix off-by-one in mapping pairs decoding bounds checks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: fix off-by-one in mapping pairs decoding bounds checks\n\nIn ntfs_mapping_pairs_decompress(), attr_end points one byte past the\nend of the attribute record:\n\n    attr_end = (u8 *)attr + le32_to_cpu(attr->length);\n\nThe two bounds checks validating that mapping pair data bytes fit within\nthe attribute use strict greater-than (>), which allows a one-byte\nout-of-bounds read when the data extends exactly to attr_end:\n\n  b = *buf & 0xf;\n  if (b) {\n      if (unlikely(buf + b > attr_end))   // off-by-one\n          goto io_error;\n      for (deltaxcn = (s8)buf[b--]; b; b--)\n          deltaxcn = (deltaxcn << 8) + buf[b];\n  }\n\nWhen buf + b == attr_end, the check evaluates to false and buf[b] reads\none byte past the valid attribute boundary. The same pattern appears in\nthe LCN delta bytes check.\n\nFix both checks to use >= so that buf[b] at exactly attr_end is\ncorrectly rejected as out of bounds.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:39","updated_at":"2026-08-18 07:16:54"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/bfe835e535fe0aa5767fdd8116f62e835ba50b55","name":"https://git.kernel.org/stable/c/bfe835e535fe0aa5767fdd8116f62e835ba50b55","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/18760a74ef7c28df93726445b5595162e62ed341","name":"https://git.kernel.org/stable/c/18760a74ef7c28df93726445b5595162e62ed341","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72210","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72210","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 bfe835e535fe0aa5767fdd8116f62e835ba50b55 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1e9ea7e04472d4e5e12e58c881eaacfb3e49b669 18760a74ef7c28df93726445b5595162e62ed341 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":"72210","cve":"CVE-2026-72210","epss":"0.005160000","percentile":"0.415480000","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/runlist.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"bfe835e535fe0aa5767fdd8116f62e835ba50b55","status":"affected","version":"1e9ea7e04472d4e5e12e58c881eaacfb3e49b669","versionType":"git"},{"lessThan":"18760a74ef7c28df93726445b5595162e62ed341","status":"affected","version":"1e9ea7e04472d4e5e12e58c881eaacfb3e49b669","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/ntfs/runlist.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: fix off-by-one in mapping pairs decoding bounds checks\n\nIn ntfs_mapping_pairs_decompress(), attr_end points one byte past the\nend of the attribute record:\n\n    attr_end = (u8 *)attr + le32_to_cpu(attr->length);\n\nThe two bounds checks validating that mapping pair data bytes fit within\nthe attribute use strict greater-than (>), which allows a one-byte\nout-of-bounds read when the data extends exactly to attr_end:\n\n  b = *buf & 0xf;\n  if (b) {\n      if (unlikely(buf + b > attr_end))   // off-by-one\n          goto io_error;\n      for (deltaxcn = (s8)buf[b--]; b; b--)\n          deltaxcn = (deltaxcn << 8) + buf[b];\n  }\n\nWhen buf + b == attr_end, the check evaluates to false and buf[b] reads\none byte past the valid attribute boundary. The same pattern appears in\nthe LCN delta bytes check.\n\nFix both checks to use >= so that buf[b] at exactly attr_end is\ncorrectly rejected as out of bounds."}],"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 - The legacy NTFS driver is exported via nfsd and commonly shared over ksmbd; remote NFS/SMB reads on an NTFS-backed export reach ntfs_mapping_pairs_decompress() through VFS read/iomap and ntfs_map_runlist() without further local access.\nAC:L - An attacker fully controls a crafted NTFS image offline and can place mapping pairs to hit the exact off-by-one boundary, reliably triggering the flaw on mount or on the next access that decompresses that attribute extent.\nPR:N - Exploitation needs only the ability to trigger server-side parsing of the mounted volume (e.g., guest/anonymous SMB or permissive NFS export); no init-namespace root or CAP_SYS_ADMIN on the victim is required at trigger time.\nUI:N - After an administrator mounts the poisoned volume, a remote client can trigger the bug with protocol read/open operations alone; no additional end-user clicks, plug-in events, or mount actions are needed during exploitation.\nS:U - Impact stays within kernel/host context (metadata parsing, runlist corruption, and resulting I/O); it does not cross a VM, container, or IOMMU security boundary to another authority.\nC:H - The flawed bounds check permits a one-byte out-of-bounds kernel read past the attribute end, often into MFT record slack that may contain stale cached data, matching OOB-read disclosure impact.\nI:H - The leaked byte is folded into runlist length/LCN deltas, yielding attacker-influenced cluster mappings that can misdirect subsequent kernel block I/O and corrupt arbitrary on-volume metadata or file data.\nA:H - Corrupt runlists and failed decompression paths surface as ntfs_error/EIO during mount or I/O and can panic or wedge the node under repeated remote access, giving a practical denial-of-service."}]}],"providerMetadata":{"dateUpdated":"2026-08-18T06:56:29.657Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/bfe835e535fe0aa5767fdd8116f62e835ba50b55"},{"url":"https://git.kernel.org/stable/c/18760a74ef7c28df93726445b5595162e62ed341"}],"title":"ntfs: fix off-by-one in mapping pairs decoding bounds checks","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72210","datePublished":"2026-08-15T05:54:05.527Z","dateReserved":"2026-08-09T03:40:39.912Z","dateUpdated":"2026-08-18T06:56:29.657Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:39","lastModifiedDate":"2026-08-18 07:16:54","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72210","Ordinal":"1","Title":"ntfs: fix off-by-one in mapping pairs decoding bounds checks","CVE":"CVE-2026-72210","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72210","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: fix off-by-one in mapping pairs decoding bounds checks\n\nIn ntfs_mapping_pairs_decompress(), attr_end points one byte past the\nend of the attribute record:\n\n    attr_end = (u8 *)attr + le32_to_cpu(attr->length);\n\nThe two bounds checks validating that mapping pair data bytes fit within\nthe attribute use strict greater-than (>), which allows a one-byte\nout-of-bounds read when the data extends exactly to attr_end:\n\n  b = *buf & 0xf;\n  if (b) {\n      if (unlikely(buf + b > attr_end))   // off-by-one\n          goto io_error;\n      for (deltaxcn = (s8)buf[b--]; b; b--)\n          deltaxcn = (deltaxcn << 8) + buf[b];\n  }\n\nWhen buf + b == attr_end, the check evaluates to false and buf[b] reads\none byte past the valid attribute boundary. The same pattern appears in\nthe LCN delta bytes check.\n\nFix both checks to use >= so that buf[b] at exactly attr_end is\ncorrectly rejected as out of bounds.","Type":"Description","Title":"ntfs: fix off-by-one in mapping pairs decoding bounds checks"}]}}}