{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72192",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72192"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs3: bound to_move in indx_insert_into_root before hdr_insert_head\n\nindx_insert_into_root() promotes a full resident $INDEX_ROOT into\n$INDEX_ALLOCATION and copies all non-last resident root entries into\na newly allocated INDEX_BUFFER via hdr_insert_head(). The source\nbyte count 'to_move' is summed from the on-disk resident entry sizes\nand is independent of the destination buffer size, which comes from\nroot->index_block_size (via indx->index_bits).\n\nA crafted NTFS image that keeps a valid, full resident root but\nshrinks root->index_block_size down to 512 after the root has been\npopulated makes hdr_insert_head() memcpy attacker-controlled resident\nentry bytes past the end of the kmalloc(1u << indx->index_bits)\nallocation returned by indx_new(). For a 512-byte destination and a\nresident root whose non-last entries total 560 bytes, the memcpy\noverruns by 120 bytes and a following memmove extends the highest\nwritten offset to 136 bytes past the allocation. The overflow bytes\nare a direct copy of on-disk entries (via kmemdup), so they are\nfully attacker-controlled.\n\nThe write is reachable from unprivileged open(O_CREAT) on a mounted\ncrafted NTFS image: a single sufficiently long create in a directory\nwhose resident root is already full forces root promotion and\ntriggers the copy.\n\nThis is a controlled out-of-bounds write of 120-136 bytes past a\nkmalloc(index_block_size) allocation, with attacker-controlled\ncontent. It is a bounded adjacent-heap corruption primitive; it is\nnot an arbitrary-address write. Successful exploitation into a named\nvictim object depends on the surrounding slab layout.\n\nReject the copy at the sink. The destination's INDEX_HDR already\nreports hdr_total (the payload capacity of the new buffer) and\nhdr_used (the bytes already consumed by the terminal END entry\ninstalled by indx_new()); require that to_move fits in the remaining\npayload before calling hdr_insert_head(). On mismatch, fail with\n-EINVAL and mark the filesystem as having a detected on-disk\ninconsistency, which is the same behaviour as the surrounding\nvalidation in this function.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/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-2026-72192"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0af83b8155cc848e9f5d2c36e20a70d024214649"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cb3161deebcaf8d36d3115abf452c633f2180fc1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/53c5f3b2da3774b41534728aba295c098c9efa19"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/194b00c99ba971fa7cf6acd747a36032c6de54eb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aaa1f956c0fc41089a4a534da7df91552a08a47c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d240f5f9d036b8180224954d9873f172b6be4dd8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67"
    }
  ],
  "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": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - ntfs3 registers export_operations; on NAS/hybrid servers exporting an NTFS volume via nfsd or ksmbd, a remote client's CREATE reaches vfs_create\u2192ntfs_create\u2192ntfs_create_inode\u2192indx_insert_entry\u2192indx_insert_into_root without any local syscall from the attacker.\nAC:L - The attacker fully controls on-disk $INDEX_ROOT layout (resident entry sizes and index_block_size); a single create in a full resident directory deterministically forces root promotion and the unchecked hdr_insert_head() copy, with no races or victim-specific heap layout required to trigger the overflow.\nPR:N - Exploitation needs only write access to create a file in the target directory on an NFS/SMB-exported NTFS share (including guest/anonymous write), or supplying removable media later mounted by the host; no init-namespace root or CAP_SYS_ADMIN is required on the trigger path.\nUI:N - Once an administrator has mounted and optionally exported the NTFS volume\u2014or desktop/kiosk automount has attached removable media\u2014the attacker issues open(O_CREAT)/touch/mkdir directly; no further victim clicks, file opens, or cooperative actions beyond that standing configuration are required.\nS:U - Impact is attacker-controlled kernel heap corruption and panic within the host kernel's security authority; this is standard local or network filesystem exploitation, not a VM escape, IOMMU bypass, or cross-scope sandbox breakout.\nC:H - hdr_insert_head() memcpy/memmove writes 120-136 attacker-controlled bytes past the kzalloc(1u<<index_bits) INDEX_BUFFER allocation; adjacent-heap corruption can disclose or influence neighboring slab objects and is scored as arbitrary-read potential under memory-corruption guidance.\nI:H - The overflow is a bounded but fully attacker-controlled out-of-bounds write past a kmalloc allocation during directory index promotion; such heap corruption is exploitable for metadata/control-structure overwrite and kernel code execution, not merely a benign crash.\nA:H - Corrupting kmalloc-allocated index buffers via unchecked memcpy/memmove can trigger KASAN faults, kernel oops, or panic; sibling ntfs3 index-insertion overflows in the same call chain are confirmed crash/panic primitives, scoring Availability High."
    }
  }
}