{"api_version":"1","generated_at":"2026-08-22T18:23:04+00:00","cve":"CVE-2026-72470","urls":{"html":"https://cve.report/CVE-2026-72470","api":"https://cve.report/api/cve/CVE-2026-72470.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72470","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72470"},"summary":{"title":"fs/ntfs3: resize log->one_page_buf when adopting on-disk page size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: resize log->one_page_buf when adopting on-disk page size\n\nlog_replay() allocates log->one_page_buf using the page size that was\nchosen from the host PAGE_SIZE:\n\n\tlog->one_page_buf = kmalloc(log->page_size, GFP_NOFS);\n\nLater, when a restart area is found, the log page size recorded on disk\nis adopted:\n\n\tt32 = le32_to_cpu(log->rst_info.r_page->sys_page_size);\n\tif (log->page_size != t32) {\n\t\tlog->l_size = log->orig_file_size;\n\t\tlog->page_size = norm_file_page(t32, &log->l_size,\n\t\t\t\t\t\tt32 == DefaultLogPageSize);\n\t}\n\nIf the on-disk page size is larger than the size used for the initial\nallocation, log->page_size grows but one_page_buf is left at its\noriginal, smaller size. A subsequent unaligned read_log_page() then\nreads log->page_size bytes into the undersized scratch buffer:\n\n\tpage_buf = page_off ? log->one_page_buf : *buffer;\n\terr = ntfs_read_run_nb_ra(ni->mi.sbi, &ni->file.run, page_vbo, page_buf,\n\t\t\t\t  log->page_size, NULL, &log->read_ahead);\n\noverflowing the allocation. This is reachable when mounting a dirty\nNTFS volume whose log was formatted with a page size larger than the\nbuffer initially allocated on the mounting host (for example a 64K-log\nvolume mounted on a host that allocated a 4K scratch buffer).\n\nGrow one_page_buf when the adopted on-disk page size exceeds the size\nused for the initial allocation. On krealloc() failure the original\nbuffer is left intact and freed by the existing error path.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:21","updated_at":"2026-08-17 06:19:14"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/4f129fc6f756f8541e5bff45b1804cc11b1ec712","name":"https://git.kernel.org/stable/c/4f129fc6f756f8541e5bff45b1804cc11b1ec712","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f1422df595d69b997d23a8f11e12c528ccef7fad","name":"https://git.kernel.org/stable/c/f1422df595d69b997d23a8f11e12c528ccef7fad","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c99444f6dfca893f6d310aae4a53c620f98f7b4f","name":"https://git.kernel.org/stable/c/c99444f6dfca893f6d310aae4a53c620f98f7b4f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374","name":"https://git.kernel.org/stable/c/2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5a35454179fe1041d9cd286f5d320ce0d448c12a","name":"https://git.kernel.org/stable/c/5a35454179fe1041d9cd286f5d320ce0d448c12a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72470","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72470","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 f1422df595d69b997d23a8f11e12c528ccef7fad git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 4f129fc6f756f8541e5bff45b1804cc11b1ec712 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 c99444f6dfca893f6d310aae4a53c620f98f7b4f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b46acd6a6a627d876898e1c84d3f84902264b445 5a35454179fe1041d9cd286f5d320ce0d448c12a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* 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":"72470","cve":"CVE-2026-72470","epss":"0.001380000","percentile":"0.036500000","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/ntfs3/fslog.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"},{"lessThan":"f1422df595d69b997d23a8f11e12c528ccef7fad","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"},{"lessThan":"4f129fc6f756f8541e5bff45b1804cc11b1ec712","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"},{"lessThan":"c99444f6dfca893f6d310aae4a53c620f98f7b4f","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"},{"lessThan":"5a35454179fe1041d9cd286f5d320ce0d448c12a","status":"affected","version":"b46acd6a6a627d876898e1c84d3f84902264b445","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/ntfs3/fslog.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.15"},{"lessThan":"5.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","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":"6.6.145","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"5.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: resize log->one_page_buf when adopting on-disk page size\n\nlog_replay() allocates log->one_page_buf using the page size that was\nchosen from the host PAGE_SIZE:\n\n\tlog->one_page_buf = kmalloc(log->page_size, GFP_NOFS);\n\nLater, when a restart area is found, the log page size recorded on disk\nis adopted:\n\n\tt32 = le32_to_cpu(log->rst_info.r_page->sys_page_size);\n\tif (log->page_size != t32) {\n\t\tlog->l_size = log->orig_file_size;\n\t\tlog->page_size = norm_file_page(t32, &log->l_size,\n\t\t\t\t\t\tt32 == DefaultLogPageSize);\n\t}\n\nIf the on-disk page size is larger than the size used for the initial\nallocation, log->page_size grows but one_page_buf is left at its\noriginal, smaller size. A subsequent unaligned read_log_page() then\nreads log->page_size bytes into the undersized scratch buffer:\n\n\tpage_buf = page_off ? log->one_page_buf : *buffer;\n\terr = ntfs_read_run_nb_ra(ni->mi.sbi, &ni->file.run, page_vbo, page_buf,\n\t\t\t\t  log->page_size, NULL, &log->read_ahead);\n\noverflowing the allocation. This is reachable when mounting a dirty\nNTFS volume whose log was formatted with a page size larger than the\nbuffer initially allocated on the mounting host (for example a 64K-log\nvolume mounted on a host that allocated a 4K scratch buffer).\n\nGrow one_page_buf when the adopted on-disk page size exceeds the size\nused for the initial allocation. On krealloc() failure the original\nbuffer is left intact and freed by the existing error path."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is triggered only during local block-device mount via the mount/fsmount syscall path (ntfs_fill_super → ntfs_loadlog_and_replay → log_replay); ntfs3 is not reachable from network-facing kernel services.\nAC:L - An attacker fully controls the crafted NTFS $LogFile on disk (sys_page_size larger than host PAGE_SIZE, valid restart area, and LSNs yielding unaligned read_log_page), so the overflow is reliably reproducible without races or victim-specific memory layout.\nPR:L - Exploitation requires mounting the malicious volume, which needs CAP_SYS_ADMIN; per kernel CNA guidance this is Low because unprivileged users can obtain that capability inside a user namespace and mount a loop-backed NTFS image.\nUI:N - No victim interaction is required when the attacker mounts their own crafted NTFS image (loop device or block device they control); log replay runs automatically during mount before any separate user file access.\nS:U - Impact is confined to kernel memory corruption and privilege escalation on the mounting host; it does not cross a VM, container, or IOMMU security boundary into another authority.\nC:H - The heap overflow writes attacker-controlled $LogFile data up to the adopted log page size (e.g., 64 KiB) beyond a smaller kmalloc buffer, corrupting adjacent kernel objects and enabling arbitrary memory disclosure primitives.\nI:H - ntfs_read_run_nb_ra writes log->page_size bytes into an undersized one_page_buf, causing an out-of-bounds heap write of attacker-controlled data that can be leveraged for arbitrary kernel modification or code execution.\nA:H - Corrupting kmalloc heap metadata or adjacent objects during log replay typically causes kernel oops/panic or hang, denying service on mount of a malicious NTFS volume even when full exploitation is not attempted."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:44:35.099Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374"},{"url":"https://git.kernel.org/stable/c/f1422df595d69b997d23a8f11e12c528ccef7fad"},{"url":"https://git.kernel.org/stable/c/4f129fc6f756f8541e5bff45b1804cc11b1ec712"},{"url":"https://git.kernel.org/stable/c/c99444f6dfca893f6d310aae4a53c620f98f7b4f"},{"url":"https://git.kernel.org/stable/c/5a35454179fe1041d9cd286f5d320ce0d448c12a"}],"title":"fs/ntfs3: resize log->one_page_buf when adopting on-disk page size","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72470","datePublished":"2026-08-15T05:57:12.472Z","dateReserved":"2026-08-09T03:40:39.934Z","dateUpdated":"2026-08-17T05:44:35.099Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:21","lastModifiedDate":"2026-08-17 06:19:14","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72470","Ordinal":"1","Title":"fs/ntfs3: resize log->one_page_buf when adopting on-disk page si","CVE":"CVE-2026-72470","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72470","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: resize log->one_page_buf when adopting on-disk page size\n\nlog_replay() allocates log->one_page_buf using the page size that was\nchosen from the host PAGE_SIZE:\n\n\tlog->one_page_buf = kmalloc(log->page_size, GFP_NOFS);\n\nLater, when a restart area is found, the log page size recorded on disk\nis adopted:\n\n\tt32 = le32_to_cpu(log->rst_info.r_page->sys_page_size);\n\tif (log->page_size != t32) {\n\t\tlog->l_size = log->orig_file_size;\n\t\tlog->page_size = norm_file_page(t32, &log->l_size,\n\t\t\t\t\t\tt32 == DefaultLogPageSize);\n\t}\n\nIf the on-disk page size is larger than the size used for the initial\nallocation, log->page_size grows but one_page_buf is left at its\noriginal, smaller size. A subsequent unaligned read_log_page() then\nreads log->page_size bytes into the undersized scratch buffer:\n\n\tpage_buf = page_off ? log->one_page_buf : *buffer;\n\terr = ntfs_read_run_nb_ra(ni->mi.sbi, &ni->file.run, page_vbo, page_buf,\n\t\t\t\t  log->page_size, NULL, &log->read_ahead);\n\noverflowing the allocation. This is reachable when mounting a dirty\nNTFS volume whose log was formatted with a page size larger than the\nbuffer initially allocated on the mounting host (for example a 64K-log\nvolume mounted on a host that allocated a 4K scratch buffer).\n\nGrow one_page_buf when the adopted on-disk page size exceeds the size\nused for the initial allocation. On krealloc() failure the original\nbuffer is left intact and freed by the existing error path.","Type":"Description","Title":"fs/ntfs3: resize log->one_page_buf when adopting on-disk page si"}]}}}