CVE-2025-38442

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

block: reject bs > ps block devices when THP is disabled

If THP is disabled and when a block device with logical block size > page size is present, the following null ptr deref panic happens during boot:

As large folio support depends on THP, only allow bs > ps block devices if THP is enabled.

Detalles técnicos trazas, registros y código del informe original

[   [13.2 mK  AOSAN: null-ptr-deref in range [0x0000000000000000-0x0000000000K0 0 0[07]
[   13.017749] RIP: 0010:create_empty_buffers+0x3b/0x380
<snip>
[   13.025448] Call Trace:
[   13.025692]  <TASK>
[   13.025895]  block_read_full_folio+0x610/0x780
[   13.026379]  ? __pfx_blkdev_get_block+0x10/0x10
[   13.027008]  ? __folio_batch_add_and_move+0x1fa/0x2b0
[   13.027548]  ? __pfx_blkdev_read_folio+0x10/0x10
[   13.028080]  filemap_read_folio+0x9b/0x200
[   13.028526]  ? __pfx_filemap_read_folio+0x10/0x10
[   13.029030]  ? __filemap_get_folio+0x43/0x620
[   13.029497]  do_read_cache_folio+0x155/0x3b0
[   13.029962]  ? __pfx_blkdev_read_folio+0x10/0x10
[   13.030381]  read_part_sector+0xb7/0x2a0
[   13.030805]  read_lba+0x174/0x2c0
<snip>
[   13.045348]  nvme_scan_ns+0x684/0x850 [nvme_core]
[   13.045858]  ? __pfx_nvme_scan_ns+0x10/0x10 [nvme_core]
[   13.046414]  ? _raw_spin_unlock+0x15/0x40
[   13.046843]  ? __switch_to+0x523/0x10a0
[   13.047253]  ? kvm_clock_get_cycles+0x14/0x30
[   13.047742]  ? __pfx_nvme_scan_ns_async+0x10/0x10 [nvme_core]
[   13.048353]  async_run_entry_fn+0x96/0x4f0
[   13.048787]  process_one_work+0x667/0x10a0
[   13.049219]  worker_thread+0x63c/0xf60

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.14%
Percentil entre todas las CVEs puntuadas: 3
Fecha de la puntuación: 6/10/2026

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)

Linux — Linux Kernel

CWE

CWE-476

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2025-38442",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "47dd67532303803a87f43195e088b3b4bcf0454d",
              "lessThan": "b025d81b96bfe8a62b6e3e6ac776608206ccbf6d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "47dd67532303803a87f43195e088b3b4bcf0454d",
              "lessThan": "4cdf1bdd45ac78a088773722f009883af30ad318",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "include/linux/blkdev.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.15.7",
              "versionType": "semver",
              "lessThanOrEqual": "6.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "include/linux/blkdev.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-07-25T16:15:29.630",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4cdf1bdd45ac78a088773722f009883af30ad318",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b025d81b96bfe8a62b6e3e6ac776608206ccbf6d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: reject bs > ps block devices when THP is disabled\n\nIf THP is disabled and when a block device with logical block size >\npage size is present, the following null ptr deref panic happens during\nboot:\n\n[   [13.2 mK  AOSAN: null-ptr-deref in range [0x0000000000000000-0x0000000000K0 0 0[07]\n[   13.017749] RIP: 0010:create_empty_buffers+0x3b/0x380\n<snip>\n[   13.025448] Call Trace:\n[   13.025692]  <TASK>\n[   13.025895]  block_read_full_folio+0x610/0x780\n[   13.026379]  ? __pfx_blkdev_get_block+0x10/0x10\n[   13.027008]  ? __folio_batch_add_and_move+0x1fa/0x2b0\n[   13.027548]  ? __pfx_blkdev_read_folio+0x10/0x10\n[   13.028080]  filemap_read_folio+0x9b/0x200\n[   13.028526]  ? __pfx_filemap_read_folio+0x10/0x10\n[   13.029030]  ? __filemap_get_folio+0x43/0x620\n[   13.029497]  do_read_cache_folio+0x155/0x3b0\n[   13.029962]  ? __pfx_blkdev_read_folio+0x10/0x10\n[   13.030381]  read_part_sector+0xb7/0x2a0\n[   13.030805]  read_lba+0x174/0x2c0\n<snip>\n[   13.045348]  nvme_scan_ns+0x684/0x850 [nvme_core]\n[   13.045858]  ? __pfx_nvme_scan_ns+0x10/0x10 [nvme_core]\n[   13.046414]  ? _raw_spin_unlock+0x15/0x40\n[   13.046843]  ? __switch_to+0x523/0x10a0\n[   13.047253]  ? kvm_clock_get_cycles+0x14/0x30\n[   13.047742]  ? __pfx_nvme_scan_ns_async+0x10/0x10 [nvme_core]\n[   13.048353]  async_run_entry_fn+0x96/0x4f0\n[   13.048787]  process_one_work+0x667/0x10a0\n[   13.049219]  worker_thread+0x63c/0xf60\n\nAs large folio support depends on THP, only allow bs > ps block devices\nif THP is enabled."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bloque: rechazar dispositivos de bloque bs &gt; ps cuando THP está deshabilitado Si THP está deshabilitado y cuando hay un dispositivo de bloque con un tamaño de bloque lógico &gt; tamaño de página, se produce el siguiente pánico de desreferencia de ptr nulo durante el arranque:[ [13.2 mK AOSAN: null-ptr-deref in range [0x0000000000000000-0x0000000000K0 0 0[07] [ 13.017749] RIP: 0010:create_empty_buffers+0x3b/0x380  [ 13.025448] Call Trace: [ 13.025692]  [ 13.025895] block_read_full_folio+0x610/0x780 [ 13.026379] ? __pfx_blkdev_get_block+0x10/0x10 [ 13.027008] ? __folio_batch_add_and_move+0x1fa/0x2b0 [ 13.027548] ? __pfx_blkdev_read_folio+0x10/0x10 [ 13.028080] filemap_read_folio+0x9b/0x200 [ 13.028526] ? __pfx_filemap_read_folio+0x10/0x10 [ 13.029030] ? __filemap_get_folio+0x43/0x620 [ 13.029497] do_read_cache_folio+0x155/0x3b0 [ 13.029962] ? __pfx_blkdev_read_folio+0x10/0x10 [ 13.030381] read_part_sector+0xb7/0x2a0 [ 13.030805] read_lba+0x174/0x2c0  [ 13.045348] nvme_scan_ns+0x684/0x850 [nvme_core] [ 13.045858] ? __pfx_nvme_scan_ns+0x10/0x10 [nvme_core] [ 13.046414] ? _raw_spin_unlock+0x15/0x40 [ 13.046843] ? __switch_to+0x523/0x10a0 [ 13.047253] ? kvm_clock_get_cycles+0x14/0x30 [ 13.047742] ? __pfx_nvme_scan_ns_async+0x10/0x10 [nvme_core] [ 13.048353] async_run_entry_fn+0x96/0x4f0 [ 13.048787] process_one_work+0x667/0x10a0 [ 13.049219] worker_thread+0x63c/0xf60 Como la compatibilidad con folios grandes depende de THP, solo se permiten dispositivos de bloque bs &gt; ps si THP está habilitado."
    }
  ],
  "lastModified": "2026-06-17T09:16:51.897",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FBA11932-25B2-4915-A601-431072CDC904",
              "versionEndExcluding": "6.15.7",
              "versionStartIncluding": "6.15"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*",
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              "matchCriteriaId": "6D4894DB-CCFE-4602-B1BF-3960B2E19A01"
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            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc3:*:*:*:*:*:*",
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          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}