{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72470",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72470"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "fs/ntfs3: resize log->one_page_buf when adopting on-disk page size",
  "details": "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72470"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2097a2537d9d1c29c0e20ed0dbf717a0ccd8f374"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f1422df595d69b997d23a8f11e12c528ccef7fad"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4f129fc6f756f8541e5bff45b1804cc11b1ec712"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c99444f6dfca893f6d310aae4a53c620f98f7b4f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5a35454179fe1041d9cd286f5d320ce0d448c12a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The flaw is triggered only during local block-device mount via the mount/fsmount syscall path (ntfs_fill_super \u2192 ntfs_loadlog_and_replay \u2192 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."
    }
  }
}