CVE-2026-72192 (GCVE-0-2026-72192)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-17 05:41
VLAI
Title
ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head
Summary
In the Linux kernel, the following vulnerability has been resolved: ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head indx_insert_into_root() promotes a full resident $INDEX_ROOT into $INDEX_ALLOCATION and copies all non-last resident root entries into a newly allocated INDEX_BUFFER via hdr_insert_head(). The source byte count 'to_move' is summed from the on-disk resident entry sizes and is independent of the destination buffer size, which comes from root->index_block_size (via indx->index_bits). A crafted NTFS image that keeps a valid, full resident root but shrinks root->index_block_size down to 512 after the root has been populated makes hdr_insert_head() memcpy attacker-controlled resident entry bytes past the end of the kmalloc(1u << indx->index_bits) allocation returned by indx_new(). For a 512-byte destination and a resident root whose non-last entries total 560 bytes, the memcpy overruns by 120 bytes and a following memmove extends the highest written offset to 136 bytes past the allocation. The overflow bytes are a direct copy of on-disk entries (via kmemdup), so they are fully attacker-controlled. The write is reachable from unprivileged open(O_CREAT) on a mounted crafted NTFS image: a single sufficiently long create in a directory whose resident root is already full forces root promotion and triggers the copy. This is a controlled out-of-bounds write of 120-136 bytes past a kmalloc(index_block_size) allocation, with attacker-controlled content. It is a bounded adjacent-heap corruption primitive; it is not an arbitrary-address write. Successful exploitation into a named victim object depends on the surrounding slab layout. Reject the copy at the sink. The destination's INDEX_HDR already reports hdr_total (the payload capacity of the new buffer) and hdr_used (the bytes already consumed by the terminal END entry installed by indx_new()); require that to_move fits in the remaining payload before calling hdr_insert_head(). On mismatch, fail with -EINVAL and mark the filesystem as having a detected on-disk inconsistency, which is the same behaviour as the surrounding validation in this function.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < 0af83b8155cc848e9f5d2c36e20a70d024214649 (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < cb3161deebcaf8d36d3115abf452c633f2180fc1 (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < 53c5f3b2da3774b41534728aba295c098c9efa19 (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < 194b00c99ba971fa7cf6acd747a36032c6de54eb (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < aaa1f956c0fc41089a4a534da7df91552a08a47c (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < d240f5f9d036b8180224954d9873f172b6be4dd8 (git)
Affected: 82cae269cfa953032fbb8980a7d554d60fb00b17 , < 9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "lang": "en",
          "value": "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 \u0027to_move\u0027 is summed from the on-disk resident entry sizes\nand is independent of the destination buffer size, which comes from\nroot-\u003eindex_block_size (via indx-\u003eindex_bits).\n\nA crafted NTFS image that keeps a valid, full resident root but\nshrinks root-\u003eindex_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 \u003c\u003c indx-\u003eindex_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\u0027s 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."
        }
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            "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"
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              "lang": "en",
              "value": "AV:N - ntfs3 registers export_operations; on NAS/hybrid servers exporting an NTFS volume via nfsd or ksmbd, a remote client\u0027s 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\u0027s 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\u003c\u003cindex_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."
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        "dateUpdated": "2026-08-17T05:41:19.697Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67"
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      "title": "ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head",
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    "datePublished": "2026-08-15T05:53:52.634Z",
    "dateReserved": "2026-08-09T03:40:39.911Z",
    "dateUpdated": "2026-08-17T05:41:19.697Z",
    "state": "PUBLISHED"
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The source\\nbyte count \u0027to_move\u0027 is summed from the on-disk resident entry sizes\\nand is independent of the destination buffer size, which comes from\\nroot-\u003eindex_block_size (via indx-\u003eindex_bits).\\n\\nA crafted NTFS image that keeps a valid, full resident root but\\nshrinks root-\u003eindex_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 \u003c\u003c indx-\u003eindex_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\u0027s 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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ntfs3/index.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"0af83b8155cc848e9f5d2c36e20a70d024214649\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"cb3161deebcaf8d36d3115abf452c633f2180fc1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"53c5f3b2da3774b41534728aba295c098c9efa19\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"194b00c99ba971fa7cf6acd747a36032c6de54eb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"aaa1f956c0fc41089a4a534da7df91552a08a47c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"d240f5f9d036b8180224954d9873f172b6be4dd8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"82cae269cfa953032fbb8980a7d554d60fb00b17\",\"lessThan\":\"9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ntfs3/index.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0af83b8155cc848e9f5d2c36e20a70d024214649\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/194b00c99ba971fa7cf6acd747a36032c6de54eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/53c5f3b2da3774b41534728aba295c098c9efa19\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b6926ac9c970ae0b2c2fe6289b16e9aa10b6a67\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aaa1f956c0fc41089a4a534da7df91552a08a47c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb3161deebcaf8d36d3115abf452c633f2180fc1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d240f5f9d036b8180224954d9873f172b6be4dd8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T15:16:08+00:00",
      "cve": "CVE-2026-72192",
      "id": "CVE-2026-72192",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ntfs3: bound to_move in indx_insert_into_root before hdr_insert_head",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72192.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-21T00:42:45Z",
      "cve": "CVE-2026-72192",
      "id": "CVE-2026-72192",
      "initial_release_date": "2026-08-21T00:42:45Z",
      "product_status:known_affected": "129",
      "product_status:known_not_affected": "155",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72192",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72192.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.