{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89615",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89615"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "fs/ntfs3: bound page_lcns[] index by the log record",
  "details": "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[almaz.alexandrovich@paragon-software.com: original patch contained changes to the problem already handled, applied partly]",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89615"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/31fdd11f75da9823500168cecb07aa45130915a3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bb742d1030864c0fe140666f639428ba4e90b2ca"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/61ca8cbbf68f77f25b699ed4358bd232f94ed43b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f4c1bc6d7331f344ffcea93c2a37badcbe15baa6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7ccb94901f38a062034b56b43c774050b113758f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1135ebc225996b3ac1a295652b19a0a706737a6c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6f7b9dbdc1b7520206abce0049bdd143eb536e75"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.4,
      "cvss_v3_severity": "High",
      "scenario": "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's 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->page_lcns[j+i-1] with i taken from the log record's 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."
    }
  }
}