{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72470", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.934Z", "datePublished": "2026-08-15T05:57:12.472Z", "dateUpdated": "2026-08-17T05:44:35.099Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:35.099Z" }, "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": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs3/fslog.c" ], "versions": [ { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "f1422df595d69b997d23a8f11e12c528ccef7fad", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "4f129fc6f756f8541e5bff45b1804cc11b1ec712", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "c99444f6dfca893f6d310aae4a53c620f98f7b4f", "status": "affected", "versionType": "git" }, { "version": "b46acd6a6a627d876898e1c84d3f84902264b445", "lessThan": "5a35454179fe1041d9cd286f5d320ce0d448c12a", "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/ntfs3/fslog.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "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": "5.15", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }