CVE-2025-71067 (GCVE-0-2025-71067)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:31 – Updated: 2026-01-13 15:31
VLAI?
Title
ntfs: set dummy blocksize to read boot_block when mounting
Summary
In the Linux kernel, the following vulnerability has been resolved: ntfs: set dummy blocksize to read boot_block when mounting When mounting, sb->s_blocksize is used to read the boot_block without being defined or validated. Set a dummy blocksize before attempting to read the boot_block. The issue can be triggered with the following syz reproducer: mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./file1\x00', 0x0) r4 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000040), 0x121403, 0x0) ioctl$FS_IOC_SETFLAGS(r4, 0x40081271, &(0x7f0000000980)=0x4000) mount(&(0x7f0000000140)=@nullb, &(0x7f0000000040)='./cgroup\x00', &(0x7f0000000000)='ntfs3\x00', 0x2208004, 0x0) syz_clone(0x88200200, 0x0, 0x0, 0x0, 0x0, 0x0) Here, the ioctl sets the bdev block size to 16384. During mount, get_tree_bdev_flags() calls sb_set_blocksize(sb, block_size(bdev)), but since block_size(bdev) > PAGE_SIZE, sb_set_blocksize() leaves sb->s_blocksize at zero. Later, ntfs_init_from_boot() attempts to read the boot_block while sb->s_blocksize is still zero, which triggers the bug. [almaz.alexandrovich@paragon-software.com: changed comment style, added return value handling]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 44a38eb4f7876513db5a1bccde74de9bc4389d43 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4fff9a625da958a33191c8553a03283786f9f417 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b3c151fe8f543f1a0b8b5df16ce5d97afa5ec85a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d1693a7d5a38acf6424235a6070bcf5b186a360d (git)
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    Linux Linux Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs3/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.120",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.64",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.3",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: set dummy blocksize to read boot_block when mounting\n\nWhen mounting, sb-\u003es_blocksize is used to read the boot_block without\nbeing defined or validated. Set a dummy blocksize before attempting to\nread the boot_block.\n\nThe issue can be triggered with the following syz reproducer:\n\n  mkdirat(0xffffffffffffff9c, \u0026(0x7f0000000080)=\u0027./file1\\x00\u0027, 0x0)\n  r4 = openat$nullb(0xffffffffffffff9c, \u0026(0x7f0000000040), 0x121403, 0x0)\n  ioctl$FS_IOC_SETFLAGS(r4, 0x40081271, \u0026(0x7f0000000980)=0x4000)\n  mount(\u0026(0x7f0000000140)=@nullb, \u0026(0x7f0000000040)=\u0027./cgroup\\x00\u0027,\n        \u0026(0x7f0000000000)=\u0027ntfs3\\x00\u0027, 0x2208004, 0x0)\n  syz_clone(0x88200200, 0x0, 0x0, 0x0, 0x0, 0x0)\n\nHere, the ioctl sets the bdev block size to 16384. During mount,\nget_tree_bdev_flags() calls sb_set_blocksize(sb, block_size(bdev)),\nbut since block_size(bdev) \u003e PAGE_SIZE, sb_set_blocksize() leaves\nsb-\u003es_blocksize at zero.\n\nLater, ntfs_init_from_boot() attempts to read the boot_block while\nsb-\u003es_blocksize is still zero, which triggers the bug.\n\n[almaz.alexandrovich@paragon-software.com: changed comment style, added\nreturn value handling]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-13T15:31:22.585Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/44a38eb4f7876513db5a1bccde74de9bc4389d43"
        },
        {
          "url": "https://git.kernel.org/stable/c/4fff9a625da958a33191c8553a03283786f9f417"
        },
        {
          "url": "https://git.kernel.org/stable/c/b3c151fe8f543f1a0b8b5df16ce5d97afa5ec85a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1693a7d5a38acf6424235a6070bcf5b186a360d"
        }
      ],
      "title": "ntfs: set dummy blocksize to read boot_block when mounting",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71067",
    "datePublished": "2026-01-13T15:31:22.585Z",
    "dateReserved": "2026-01-13T15:30:19.647Z",
    "dateUpdated": "2026-01-13T15:31:22.585Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-71067\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-13T16:16:06.077\",\"lastModified\":\"2026-01-13T16:16:06.077\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nntfs: set dummy blocksize to read boot_block when mounting\\n\\nWhen mounting, sb-\u003es_blocksize is used to read the boot_block without\\nbeing defined or validated. Set a dummy blocksize before attempting to\\nread the boot_block.\\n\\nThe issue can be triggered with the following syz reproducer:\\n\\n  mkdirat(0xffffffffffffff9c, \u0026(0x7f0000000080)=\u0027./file1\\\\x00\u0027, 0x0)\\n  r4 = openat$nullb(0xffffffffffffff9c, \u0026(0x7f0000000040), 0x121403, 0x0)\\n  ioctl$FS_IOC_SETFLAGS(r4, 0x40081271, \u0026(0x7f0000000980)=0x4000)\\n  mount(\u0026(0x7f0000000140)=@nullb, \u0026(0x7f0000000040)=\u0027./cgroup\\\\x00\u0027,\\n        \u0026(0x7f0000000000)=\u0027ntfs3\\\\x00\u0027, 0x2208004, 0x0)\\n  syz_clone(0x88200200, 0x0, 0x0, 0x0, 0x0, 0x0)\\n\\nHere, the ioctl sets the bdev block size to 16384. During mount,\\nget_tree_bdev_flags() calls sb_set_blocksize(sb, block_size(bdev)),\\nbut since block_size(bdev) \u003e PAGE_SIZE, sb_set_blocksize() leaves\\nsb-\u003es_blocksize at zero.\\n\\nLater, ntfs_init_from_boot() attempts to read the boot_block while\\nsb-\u003es_blocksize is still zero, which triggers the bug.\\n\\n[almaz.alexandrovich@paragon-software.com: changed comment style, added\\nreturn value handling]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/44a38eb4f7876513db5a1bccde74de9bc4389d43\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4fff9a625da958a33191c8553a03283786f9f417\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3c151fe8f543f1a0b8b5df16ce5d97afa5ec85a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1693a7d5a38acf6424235a6070bcf5b186a360d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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