FKIE_CVE-2025-71067

Vulnerability from fkie_nvd - Published: 2026-01-13 16:16 - Updated: 2026-06-17 10:03
Severity
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]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c9327c8abf9c8f046e45008bb43d94d8ee5c6c5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/44a38eb4f7876513db5a1bccde74de9bc4389d43
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4fff9a625da958a33191c8553a03283786f9f417
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b3c151fe8f543f1a0b8b5df16ce5d97afa5ec85a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1693a7d5a38acf6424235a6070bcf5b186a360d
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "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": [
            {
              "lessThan": "0c9327c8abf9c8f046e45008bb43d94d8ee5c6c5",
              "status": "affected",
              "version": "28861e3bbd9e7ac4cd9c811aad71b4d116e27930",
              "versionType": "git"
            },
            {
              "lessThan": "44a38eb4f7876513db5a1bccde74de9bc4389d43",
              "status": "affected",
              "version": "28861e3bbd9e7ac4cd9c811aad71b4d116e27930",
              "versionType": "git"
            },
            {
              "lessThan": "4fff9a625da958a33191c8553a03283786f9f417",
              "status": "affected",
              "version": "28861e3bbd9e7ac4cd9c811aad71b4d116e27930",
              "versionType": "git"
            },
            {
              "lessThan": "b3c151fe8f543f1a0b8b5df16ce5d97afa5ec85a",
              "status": "affected",
              "version": "28861e3bbd9e7ac4cd9c811aad71b4d116e27930",
              "versionType": "git"
            },
            {
              "lessThan": "d1693a7d5a38acf6424235a6070bcf5b186a360d",
              "status": "affected",
              "version": "28861e3bbd9e7ac4cd9c811aad71b4d116e27930",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs3/super.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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]"
    },
    {
      "lang": "es",
      "value": "En el n\u00facleo de Linux, se ha solucionado la siguiente vulnerabilidad: ntfs: se establece un tama\u00f1o de bloque ficticio para leer boot_block al montar. Al montar, se utiliza sb-\u0026gt;s_blocksize para leer boot_block sin que est\u00e9 definido ni validado. Establecer un tama\u00f1o de bloque ficticio antes de intentar leer el boot_block. El problema se puede reproducir con el siguiente c\u00f3digo de Syz: mkdirat(0xffffffffffffff9c, \u0026amp;(0x7f0000000080)=\u201c./file1\\x00\u201d, 0x0) r4 = openat$nullb(0xffffffffffffff9c, \u0026amp;(0x7f0000000040), 0x121403, 0x0) ioctl$FS_IOC_SETFLAGS(r4, 0x40081271, \u0026amp;(0x7f0000000980)=0x4000) mount(\u0026amp;(0x7f0000000140)=@nullb, \u0026amp;(0x7f0000000040)=\u0027./ cgroup\\x00\u0027, \u0026amp;(0x7f0000000000)=\u201cntfs3\\x00\u201d, 0x2208004, 0x0) syz_clone(0x88200200, 0x0, 0x0, 0x0, 0x0, 0x0) Aqu\u00ed, el ioctl establece el tama\u00f1o de bloque de bdev en 16384. Durante el montaje, get_tree_bdev_flags() llama a sb_set_blocksize(sb, block_size(bdev)), pero dado que block_size(bdev) \u0026gt; PAGE_SIZE, sb_set_blocksize() deja sb-\u0026gt;s_blocksize en cero. M\u00e1s tarde, ntfs_init_from_boot() intenta leer el boot_block mientras sb-\u0026gt;s_blocksize sigue siendo cero, lo que desencadena el error. [almaz.alexandrovich@paragon-software.com: se ha cambiado el estilo de los comentarios y se ha a\u00f1adido el manejo del valor de retorno]"
    }
  ],
  "id": "CVE-2025-71067",
  "lastModified": "2026-06-17T10:03:35.663",
  "metrics": {},
  "published": "2026-01-13T16:16:06.077",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0c9327c8abf9c8f046e45008bb43d94d8ee5c6c5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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