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fs/ntfs3: bound page_lcns[] index by the log record

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound page_lcns[] index by the log record The copy_lcns loop and the redo shorten loop index page_lcns[] at j + i, where i runs up to the log record's lcns_follow. That count is checked only against the record's own length, not the target entry, so check_dp_table() (which validates the entry's lcns_follow) does not cover it: the copy_lcns entry may even be freshly allocated after that check, and find_dp() bounds j but not i. A crafted record thus overflows page_lcns[] of an otherwise valid entry. Add dp_range_ok() and reject, before each loop, any record whose run does not fit the entry. These are the only two page_lcns[] accesses indexed by the record rather than the entry, so together with the entry validation every access is now bounded. [almaz.alexandrovich@paragon-software.com: original patch contained changes to the problem already handled, applied partly]

Products
Kernel
Affected versions
Not specified
Fixed versions
5.15.221, 6.1.188, 6.12.109, 6.18.50, 6.6.157, 7.2.4
CVEs
CVE-2026-89615
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 17:09 UTC · Revision 1

Source evidence

fs/ntfs3: bound page_lcns[] index by the log record

core-osv · Original source

Published 11 Sept 2026, 19:45 UTC

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound page_lcns[] index by the log record The copy_lcns loop and the redo shorten loop index page_lcns[] at j + i, where i runs up to the log record's lcns_follow. That count is checked only against the record's own length, not the target entry, so check_dp_table() (which validates the entry's lcns_follow) does not cover it: the copy_lcns entry may even be freshly allocated after that check, and find_dp() bounds j but not i. A crafted record thus overflows page_lcns[] of an otherwise valid entry. Add dp_range_ok() and reject, before each loop, any record whose run does not fit the entry. These are the only two page_lcns[] accesses indexed by the record rather than the entry, so together with the entry validation every access is now bounded. [almaz.alexandrovich@paragon-software.com: original patch contained changes to the problem already handled, applied partly]

osv:CVE-2026-89615

Kernel

Fixed versions: 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, 7.2.4

Complete source record
{
  "id": "7ab5254aecc26a8717182fb7365d77bf65a099ac818ab97b84ab9b25c837f5ae",
  "url": "https://osv.dev/vulnerability/CVE-2026-89615",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fs/ntfs3: bound page_lcns[] index by the log record",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound page_lcns[] index by the log record The copy_lcns loop and the redo shorten loop index page_lcns[] at j + i, where i runs up to the log record's lcns_follow. That count is checked only against the record's own length, not the target entry, so check_dp_table() (which validates the entry's lcns_follow) does not cover it: the copy_lcns entry may even be freshly allocated after that check, and find_dp() bounds j but not i. A crafted record thus overflows page_lcns[] of an otherwise valid entry. Add dp_range_ok() and reject, before each loop, any record whose run does not fit the entry. These are the only two page_lcns[] accesses indexed by the record rather than the entry, so together with the entry validation every access is now bounded. [almaz.alexandrovich@paragon-software.com: original patch contained changes to the problem already handled, applied partly]",
    "evidence": "osv:CVE-2026-89615",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-89615",
      "aliases": [
        "CVE-2026-89615"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "b46acd6a6a627d876898e1c84d3f84902264b445"
                },
                {
                  "fixed": "31fdd11f75da9823500168cecb07aa45130915a3"
                },
                {
                  "fixed": "bb742d1030864c0fe140666f639428ba4e90b2ca"
                },
                {
                  "fixed": "61ca8cbbf68f77f25b699ed4358bd232f94ed43b"
                },
                {
                  "fixed": "f4c1bc6d7331f344ffcea93c2a37badcbe15baa6"
                },
                {
                  "fixed": "7ccb94901f38a062034b56b43c774050b113758f"
                },
                {
                  "fixed": "1135ebc225996b3ac1a295652b19a0a706737a6c"
                },
                {
                  "fixed": "6f7b9dbdc1b7520206abce0049bdd143eb536e75"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89615.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "5.15.221"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.188"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.109"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.50"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89615.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.139462332Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1135ebc225996b3ac1a295652b19a0a706737a6c",
        "https://git.kernel.org/stable/c/31fdd11f75da9823500168cecb07aa45130915a3",
        "https://git.kernel.org/stable/c/61ca8cbbf68f77f25b699ed4358bd232f94ed43b",
        "https://git.kernel.org/stable/c/6f7b9dbdc1b7520206abce0049bdd143eb536e75",
        "https://git.kernel.org/stable/c/7ccb94901f38a062034b56b43c774050b113758f",
        "https://git.kernel.org/stable/c/bb742d1030864c0fe140666f639428ba4e90b2ca",
        "https://git.kernel.org/stable/c/f4c1bc6d7331f344ffcea93c2a37badcbe15baa6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89615.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89615",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89615.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89615",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519949,
  "published_at": "2026-09-11T19:45:15.397+00:00"
}