fs/ntfs3: Fix null-ptr-deref on inode->i_op in ntfs_lookup()

{
  "id": "6d4265aca0c34d4e0260536816700b078862a6eadcfcff7fe7de23a92255995d",
  "url": "https://osv.dev/vulnerability/CVE-2023-53294",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fs/ntfs3: Fix null-ptr-deref on inode->i_op in ntfs_lookup()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: Fix null-ptr-deref on inode->i_op in ntfs_lookup() Syzbot reported a null-ptr-deref bug: ntfs3: loop0: Different NTFS' sector size (1024) and media sector size (512) ntfs3: loop0: Mark volume as dirty due to NTFS errors general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] RIP: 0010:d_flags_for_inode fs/dcache.c:1980 [inline] RIP: 0010:__d_add+0x5ce/0x800 fs/dcache.c:2796 Call Trace: d_splice_alias+0x122/0x3b0 fs/dcache.c:3191 lookup_open fs/namei.c:3391 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x10e6/0x2df0 fs/namei.c:3688 do_filp_open+0x264/0x4f0 fs/namei.c:3718 do_sys_openat2+0x124/0x4e0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_open fs/open.c:1334 [inline] __se_sys_open fs/open.c:1330 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1330 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd If the MFT record of ntfs inode is not a base record, inode->i_op can be NULL. And a null-ptr-deref may happen: ntfs_lookup() dir_search_u() # inode->i_op is set to NULL d_splice_alias() __d_add() d_flags_for_inode() # inode->i_op->get_link null-ptr-deref Fix this by adding a Check on inode->i_op before calling the d_splice_alias() function.",
    "evidence": "osv:CVE-2023-53294",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.29",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.16",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.3.3",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-53294",
      "aliases": [
        "CVE-2023-53294"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "f8d9e062a695a3665c4635c4f216a75912687598"
                },
                {
                  "fixed": "d69d5e2a81df94534bdb468bcdd26060fcb7191a"
                },
                {
                  "fixed": "2ba22cbc6a1cf4b58195adbee0b80262e53992d3"
                },
                {
                  "fixed": "e78240bc4b94fc42854d65e657bb998100cc8e1b"
                },
                {
                  "fixed": "254e69f284d7270e0abdc023ee53b71401c3ba0c"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53294.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "5.15.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.29"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.16"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.3.3"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53294.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.661806135Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/254e69f284d7270e0abdc023ee53b71401c3ba0c",
        "https://git.kernel.org/stable/c/2ba22cbc6a1cf4b58195adbee0b80262e53992d3",
        "https://git.kernel.org/stable/c/d69d5e2a81df94534bdb468bcdd26060fcb7191a",
        "https://git.kernel.org/stable/c/e78240bc4b94fc42854d65e657bb998100cc8e1b",
        "https://git.kernel.org/stable/c/f8d9e062a695a3665c4635c4f216a75912687598",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53294.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53294",
        "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/2023/53xxx/CVE-2023-53294.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53294",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493156,
  "published_at": "2025-09-16T08:11:26.926+00:00"
}