CVE-2026-89615

Full vulnerability record from the local CVENow database.

Description

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. [[email protected]: original patch contained changes to the problem already handled, applied partly]

Severity

HIGH

CVSS score

8.4 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-11 20:19:46.653000

Last modified

2026-10-19 09:17:58.143000

View original CVE JSON

{
  "id": "CVE-2026-89615",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-11T20:19:46.653",
  "lastModified": "2026-10-19T09:17:58.143",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound page_lcns[] index by the log record\n\nThe copy_lcns loop and the redo shorten loop index page_lcns[] at j + i,\nwhere i runs up to the log record's lcns_follow. That count is checked only\nagainst the record's own length, not the target entry, so check_dp_table()\n(which validates the entry's lcns_follow) does not cover it: the copy_lcns\nentry may even be freshly allocated after that check, and find_dp() bounds j\nbut not i. A crafted record thus overflows page_lcns[] of an otherwise valid\nentry.\n\nAdd dp_range_ok() and reject, before each loop, any record whose run does\nnot fit the entry. These are the only two page_lcns[] accesses indexed by\nthe record rather than the entry, so together with the entry validation\nevery access is now bounded.\n\n[[email protected]: original patch contained changes to the problem already handled, applied partly]"
    }
  ],
  "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": "31fdd11f75da9823500168cecb07aa45130915a3",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
              "lessThan": "bb742d1030864c0fe140666f639428ba4e90b2ca",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
              "lessThan": "61ca8cbbf68f77f25b699ed4358bd232f94ed43b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
              "lessThan": "f4c1bc6d7331f344ffcea93c2a37badcbe15baa6",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
              "lessThan": "7ccb94901f38a062034b56b43c774050b113758f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
              "lessThan": "1135ebc225996b3ac1a295652b19a0a706737a6c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "b46acd6a6a627d876898e1c84d3f84902264b445",
              "lessThan": "6f7b9dbdc1b7520206abce0049bdd143eb536e75",
              "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": "5.15.221",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.188",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.109",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.50",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.4",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "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:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1135ebc225996b3ac1a295652b19a0a706737a6c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/31fdd11f75da9823500168cecb07aa45130915a3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/61ca8cbbf68f77f25b699ed4358bd232f94ed43b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6f7b9dbdc1b7520206abce0049bdd143eb536e75",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7ccb94901f38a062034b56b43c774050b113758f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bb742d1030864c0fe140666f639428ba4e90b2ca",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f4c1bc6d7331f344ffcea93c2a37badcbe15baa6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}