CVE-2026-64532 (GCVE-0-2026-64532)

Vulnerability from cvelistv5 – Published: 2026-07-27 06:32 – Updated: 2026-07-27 06:32
VLAI
Title
fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < b20e5a709d8bd190d6e4645606763c7423e694c1 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < d41b382068ca4e64e421f736cdd700095464b6ac (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 429d653ca641d38a78609b8f62e81a0a5c780a2d (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 315d3a9a48b49f889da3d858a9307e677cb9e1bd (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < be306b8d9143a9c076c804a7ca025d69caf9c448 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 36feda687afebae24c472202694448738809c411 (git)
Affected: b46acd6a6a627d876898e1c84d3f84902264b445 , < 3e127829e57f5190f612412ece4541cb96d5ec7a (git)
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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-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
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      "cpeApplicability": [
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-27T06:32:33.159Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/b20e5a709d8bd190d6e4645606763c7423e694c1"
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          "url": "https://git.kernel.org/stable/c/d41b382068ca4e64e421f736cdd700095464b6ac"
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/3e127829e57f5190f612412ece4541cb96d5ec7a"
        }
      ],
      "title": "fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}",
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    "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": "2026-07-27T06:32:33.159Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-07-28",
      "epss": "0.00164",
      "percentile": "0.06026"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ntfs3/fslog.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"b20e5a709d8bd190d6e4645606763c7423e694c1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"d41b382068ca4e64e421f736cdd700095464b6ac\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"429d653ca641d38a78609b8f62e81a0a5c780a2d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"315d3a9a48b49f889da3d858a9307e677cb9e1bd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"be306b8d9143a9c076c804a7ca025d69caf9c448\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"36feda687afebae24c472202694448738809c411\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b46acd6a6a627d876898e1c84d3f84902264b445\",\"lessThan\":\"3e127829e57f5190f612412ece4541cb96d5ec7a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ntfs3/fslog.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-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/315d3a9a48b49f889da3d858a9307e677cb9e1bd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/36feda687afebae24c472202694448738809c411\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3e127829e57f5190f612412ece4541cb96d5ec7a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/429d653ca641d38a78609b8f62e81a0a5c780a2d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b20e5a709d8bd190d6e4645606763c7423e694c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be306b8d9143a9c076c804a7ca025d69caf9c448\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d41b382068ca4e64e421f736cdd700095464b6ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-29T05:57:11+00:00",
      "cve": "CVE-2026-64532",
      "id": "CVE-2026-64532",
      "initial_release_date": "2026-07-27T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64532.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-27T17:00:03Z",
      "cve": "CVE-2026-64532",
      "id": "CVE-2026-64532",
      "initial_release_date": "2026-07-27T17:00:03Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64532",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64532.json",
      "version": "2"
    }
  }
}



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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

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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.