CVE-2025-71067
Estado: AplazadaSin puntuar—
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:
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.
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[almaz.alexandrovich@paragon-software.com: changed comment style, added return value handling]
Detalles técnicos trazas, registros y código del informe original
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)CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.20%
- Percentil entre todas las CVEs puntuadas: 9
- Fecha de la puntuación: 4/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/0c9327c8abf9c8f046e45008bb43d94d8ee5c6c5
- https://git.kernel.org/stable/c/44a38eb4f7876513db5a1bccde74de9bc4389d43
- https://git.kernel.org/stable/c/4fff9a625da958a33191c8553a03283786f9f417
- https://git.kernel.org/stable/c/b3c151fe8f543f1a0b8b5df16ce5d97afa5ec85a
- https://git.kernel.org/stable/c/d1693a7d5a38acf6424235a6070bcf5b186a360d
JSON original (NVD)
Mostrar
{
"id": "CVE-2025-71067",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "28861e3bbd9e7ac4cd9c811aad71b4d116e27930",
"lessThan": "0c9327c8abf9c8f046e45008bb43d94d8ee5c6c5",
"versionType": "git"
},
{
"status": "affected",
"version": "28861e3bbd9e7ac4cd9c811aad71b4d116e27930",
"lessThan": "44a38eb4f7876513db5a1bccde74de9bc4389d43",
"versionType": "git"
},
{
"status": "affected",
"version": "28861e3bbd9e7ac4cd9c811aad71b4d116e27930",
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"versionType": "git"
},
{
"status": "affected",
"version": "28861e3bbd9e7ac4cd9c811aad71b4d116e27930",
"lessThan": "b3c151fe8f543f1a0b8b5df16ce5d97afa5ec85a",
"versionType": "git"
},
{
"status": "affected",
"version": "28861e3bbd9e7ac4cd9c811aad71b4d116e27930",
"lessThan": "d1693a7d5a38acf6424235a6070bcf5b186a360d",
"versionType": "git"
}
],
"programFiles": [
"fs/ntfs3/super.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.120",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.64",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.3",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ntfs3/super.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-01-13T16:16:06.077",
"references": [
{
"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",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Deferred",
"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->s_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, &(0x7f0000000080)='./file1\\x00', 0x0)\n r4 = openat$nullb(0xffffffffffffff9c, &(0x7f0000000040), 0x121403, 0x0)\n ioctl$FS_IOC_SETFLAGS(r4, 0x40081271, &(0x7f0000000980)=0x4000)\n mount(&(0x7f0000000140)=@nullb, &(0x7f0000000040)='./cgroup\\x00',\n &(0x7f0000000000)='ntfs3\\x00', 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) > PAGE_SIZE, sb_set_blocksize() leaves\nsb->s_blocksize at zero.\n\nLater, ntfs_init_from_boot() attempts to read the boot_block while\nsb->s_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 núcleo de Linux, se ha solucionado la siguiente vulnerabilidad: ntfs: se establece un tamaño de bloque ficticio para leer boot_block al montar. Al montar, se utiliza sb->s_blocksize para leer boot_block sin que esté definido ni validado. Establecer un tamaño de bloque ficticio antes de intentar leer el boot_block. El problema se puede reproducir con el siguiente código de Syz: 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) Aquí, el ioctl establece el tamaño 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) > PAGE_SIZE, sb_set_blocksize() deja sb->s_blocksize en cero. Más tarde, ntfs_init_from_boot() intenta leer el boot_block mientras sb->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 añadido el manejo del valor de retorno]"
}
],
"lastModified": "2026-06-17T10:03:35.663",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}