CVE-2026-89615 (GCVE-0-2026-89615)
Vulnerability from cvelistv5
Published
2026-09-11 19:45
Modified
2026-10-19 08:49
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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]
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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{
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          "product": "Linux",
          "programFiles": [
            "fs/ntfs3/fslog.c"
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              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
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                  "vulnerable": true
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      ],
      "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\u0027s lcns_follow. That count is checked only\nagainst the record\u0027s own length, not the target entry, so check_dp_table()\n(which validates the entry\u0027s 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[almaz.alexandrovich@paragon-software.com: original patch contained changes to the problem already handled, applied partly]"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The page_lcns[] overflow is reached only in log_replay() on the local ntfs3 mount path (path_mount\u2192ntfs_fill_super\u2192ntfs_loadlog_and_replay\u2192log_replay). ksmbd/nfsd never parse $LogFile; journal replay runs at fill_super, not while serving exported files.\nAC:L - An attacker fully controls crafted $LogFile LOG_REC_HDR fields (target_vcn, lcns_follow) and the target DIR_PAGE_ENTRY. find_dp() only bounds the base index j; the redo shorten loop then indexes page_lcns[j+i-1] with i up to the record\u0027s lcns_follow, so the OOB access is deterministic with no race.\nPR:N - No account or privilege on the victim is required: a crafted NTFS volume on USB/removable media, a disk image, or shared storage is sufficient for udisks2/systemd automount or an administrator mount to run $LogFile replay as root.\nUI:N - Desktop, kiosk, and shared-workstation automounters mount attacker-supplied NTFS media and run log_replay() inside ntfs_fill_super() without the user opening files or confirming a dialog; attaching the crafted volume is sufficient to trigger the overflow.\nS:U - Heap out-of-bounds page_lcns[] access occurs in the host kernel during ntfs3 journal replay in the mounting process; impact stays within one kernel security authority and is not a VM escape or IOMMU/DMA bypass.\nC:H - The redo shorten loop reads dp-\u003epage_lcns[j+i-1] with i taken from the log record\u0027s lcns_follow (u16, up to 65535 entries / ~512KB past the DIR_PAGE_ENTRY). That unbounded slab out-of-bounds read of adjacent heap is Confidentiality High per kernel OOB-read guidance.\nI:H - On unfixed kernels the copy_lcns analysis loop wrote attacker-controlled __le64 values past page_lcns[], a heap OOB write. Independently, OOB page_lcns[] reads in the redo pass control dlen passed to do_action() memcpy/memmove into MFT and index buffers, enabling further kernel writes.\nA:H - Indexing far past the kmalloc-backed DIR_PAGE_ENTRY in log_replay() on mount can fault unmapped adjacent slab memory, causing a kernel oops or panic. The crash is repeatable on every mount of the crafted NTFS volume."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:49:47.839Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/31fdd11f75da9823500168cecb07aa45130915a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb742d1030864c0fe140666f639428ba4e90b2ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/61ca8cbbf68f77f25b699ed4358bd232f94ed43b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4c1bc6d7331f344ffcea93c2a37badcbe15baa6"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ccb94901f38a062034b56b43c774050b113758f"
        },
        {
          "url": "https://git.kernel.org/stable/c/1135ebc225996b3ac1a295652b19a0a706737a6c"
        },
        {
          "url": "https://git.kernel.org/stable/c/6f7b9dbdc1b7520206abce0049bdd143eb536e75"
        }
      ],
      "title": "fs/ntfs3: bound page_lcns[] index by the log record",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89615",
    "datePublished": "2026-09-11T19:45:15.397Z",
    "dateReserved": "2026-09-11T19:38:34.735Z",
    "dateUpdated": "2026-10-19T08:49:47.839Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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