CVE-2026-64532 (GCVE-0-2026-64532)
Vulnerability from cvelistv5
Published
2026-07-27 06:32
Modified
2026-08-17 04:57
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation} In do_action()'s UpdateRecordDataRoot (fslog.c:3489) and UpdateRecordDataAllocation (fslog.c:3697) cases, the memmove destination is `Add2Ptr(e, le16_to_cpu(e->view.data_off))`, where e->view.data_off comes from an on-disk NTFS_DE inside an INDEX_ROOT or INDEX_BUFFER. Neither case validates view.data_off + dlen against e->size; the existing check_if_index_root / check_if_alloc_index helpers walk the entry chain and validate the entry's offset, but not its internal view fields. The neighbouring read sites (e.g., fs/ntfs3/index.c when iterating view entries) check view.data_off + view.data_size <= e->size. Apply the same bound at the two memmove sites. Reproduced under UML+KASAN on mainline 8d90b09e6741 via pr_warn-only probe instrumentation: with view.data_off forced to 0xFFFC, the memmove writes 32 bytes past the end of the NTFS_DE. This is similar in shape to Pavitra Jha's 2026-05-02 patch "fs/ntfs3: prevent oob in case UpdateRecordDataRoot" (<20260502105008.21827-1-jhapavitra98@gmail.com>) which proposes calling ntfs3_bad_de_range(); that helper does not exist in mainline. This patch uses inline checks.
References
Impacted products
Vendor Product Version
Linux Linux Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs3/fslog.c"
          ],
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          "product": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "version": "7.1.5",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionEndExcluding": "5.15.212",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}\n\nIn do_action()\u0027s UpdateRecordDataRoot (fslog.c:3489) and\nUpdateRecordDataAllocation (fslog.c:3697) cases, the memmove\ndestination is `Add2Ptr(e, le16_to_cpu(e-\u003eview.data_off))`,\nwhere e-\u003eview.data_off comes from an on-disk NTFS_DE inside\nan INDEX_ROOT or INDEX_BUFFER.  Neither case validates\nview.data_off + dlen against e-\u003esize; the existing\ncheck_if_index_root / check_if_alloc_index helpers walk the\nentry chain and validate the entry\u0027s offset, but not its\ninternal view fields.\n\nThe neighbouring read sites (e.g., fs/ntfs3/index.c when\niterating view entries) check view.data_off + view.data_size\n\u003c= e-\u003esize.  Apply the same bound at the two memmove sites.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 via\npr_warn-only probe instrumentation: with view.data_off forced\nto 0xFFFC, the memmove writes 32 bytes past the end of the\nNTFS_DE.\n\nThis is similar in shape to Pavitra Jha\u0027s 2026-05-02 patch\n\"fs/ntfs3: prevent oob in case UpdateRecordDataRoot\"\n(\u003c20260502105008.21827-1-jhapavitra98@gmail.com\u003e) which\nproposes calling ntfs3_bad_de_range(); that helper does not\nexist in mainline.  This patch uses inline checks."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable journal-replay handlers are reached by mounting a crafted NTFS image or block device, not through a network receive path.\nAC:L - The attacker controls the index entry offset, copy length, and copied redo or undo data, making the out-of-bounds write deterministic without a race or external condition.\nPR:N - Although directly mounting NTFS3 requires initial-namespace CAP_SYS_ADMIN, an attacker needs no target-system privileges to supply a malicious image or volume that a privileged victim mounts.\nUI:R - In the no-privilege attack scenario, a victim must mount the crafted filesystem read-write so journal replay executes the vulnerable operation.\nS:U - The corruption occurs within the host kernel and impacts resources governed by that same security authority; it is not inherently a VM, IOMMU, or hypervisor escape.\nC:H - The attacker-controlled heap out-of-bounds write can corrupt adjacent kernel objects and plausibly enable code execution or arbitrary kernel-memory disclosure.\nI:H - The attacker chooses the copied bytes and a forward offset of up to 65535 bytes, permitting corruption of adjacent kernel objects or persistent filesystem metadata and potential control-flow hijacking.\nA:H - The out-of-bounds memmove can produce a kernel oops or panic during mount, as supported by the KASAN reproduction, causing complete system unavailability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:57:10.088Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b20e5a709d8bd190d6e4645606763c7423e694c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/d41b382068ca4e64e421f736cdd700095464b6ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/429d653ca641d38a78609b8f62e81a0a5c780a2d"
        },
        {
          "url": "https://git.kernel.org/stable/c/315d3a9a48b49f889da3d858a9307e677cb9e1bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/be306b8d9143a9c076c804a7ca025d69caf9c448"
        },
        {
          "url": "https://git.kernel.org/stable/c/36feda687afebae24c472202694448738809c411"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e127829e57f5190f612412ece4541cb96d5ec7a"
        }
      ],
      "title": "fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64532",
    "datePublished": "2026-07-27T06:32:33.159Z",
    "dateReserved": "2026-07-19T15:36:31.794Z",
    "dateUpdated": "2026-08-17T04:57:10.088Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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