CVE-2025-38139

Estado: ModificadaAlta (7.1)—

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

netfs: Fix oops in write-retry from mis-resetting the subreq iterator

Fix the resetting of the subrequest iterator in netfs_retry_write_stream() to use the iterator-reset function as the iterator may have been shortened by a previous retry. In such a case, the amount of data to be written by the subrequest is not "subreq->len" but "subreq->len - subreq->transferred".

Without this, KASAN may see an error in iov_iter_revert():

Detalles técnicos trazas, registros y código del informe original

   BUG: KASAN: slab-out-of-bounds in iov_iter_revert lib/iov_iter.c:633 [inline]
   BUG: KASAN: slab-out-of-bounds in iov_iter_revert+0x443/0x5a0 lib/iov_iter.c:611
   Read of size 4 at addr ffff88802912a0b8 by task kworker/u32:7/1147

   CPU: 1 UID: 0 PID: 1147 Comm: kworker/u32:7 Not tainted 6.15.0-rc6-syzkaller-00052-g9f35e33144ae #0 PREEMPT(full)
   Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
   Workqueue: events_unbound netfs_write_collection_worker
   Call Trace:
    <TASK>
    __dump_stack lib/dump_stack.c:94 [inline]
    dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
    print_address_description mm/kasan/report.c:408 [inline]
    print_report+0xc3/0x670 mm/kasan/report.c:521
    kasan_report+0xe0/0x110 mm/kasan/report.c:634
    iov_iter_revert lib/iov_iter.c:633 [inline]
    iov_iter_revert+0x443/0x5a0 lib/iov_iter.c:611
    netfs_retry_write_stream fs/netfs/write_retry.c:44 [inline]
    netfs_retry_writes+0x166d/0x1a50 fs/netfs/write_retry.c:231
    netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
    netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374
    process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
    process_scheduled_works kernel/workqueue.c:3319 [inline]
    worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
    kthread+0x3c2/0x780 kernel/kthread.c:464
    ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
    </TASK>

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Puntuación base: 7.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.45%
Percentil entre todas las CVEs puntuadas: 37
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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1499.004 Application or System Exploitationimpact65 %

CWE-125 (out-of-bounds read) en kernel Linux con AV:L/PR:L causa DoS por corrupción de memoria. No hay ejecución de código confirmada, solo crash de kernel.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Filter Network Traffic Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-125

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2025-38139",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      },
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        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 1.8
      }
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  "affected": [
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      "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": "cd0277ed0c188dd40e7744e89299af7b78831ca4",
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              "lessThan": "4481f7f2b3df123ec77e828c849138f75cff2bf2",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/netfs/write_retry.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "product": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.12"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.12",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.37",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.15.3",
              "versionType": "semver",
              "lessThanOrEqual": "6.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/netfs/write_retry.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-07-03T09:15:28.500",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4481f7f2b3df123ec77e828c849138f75cff2bf2",
      "tags": [
        "Patch"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/bd0edaf99a920b1a9decd773179caacacb61d0fd",
      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/e0fefe9bc07e6101fdc57abda3644f296c114e31",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix oops in write-retry from mis-resetting the subreq iterator\n\nFix the resetting of the subrequest iterator in netfs_retry_write_stream()\nto use the iterator-reset function as the iterator may have been shortened\nby a previous retry.  In such a case, the amount of data to be written by\nthe subrequest is not \"subreq->len\" but \"subreq->len -\nsubreq->transferred\".\n\nWithout this, KASAN may see an error in iov_iter_revert():\n\n   BUG: KASAN: slab-out-of-bounds in iov_iter_revert lib/iov_iter.c:633 [inline]\n   BUG: KASAN: slab-out-of-bounds in iov_iter_revert+0x443/0x5a0 lib/iov_iter.c:611\n   Read of size 4 at addr ffff88802912a0b8 by task kworker/u32:7/1147\n\n   CPU: 1 UID: 0 PID: 1147 Comm: kworker/u32:7 Not tainted 6.15.0-rc6-syzkaller-00052-g9f35e33144ae #0 PREEMPT(full)\n   Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\n   Workqueue: events_unbound netfs_write_collection_worker\n   Call Trace:\n    <TASK>\n    __dump_stack lib/dump_stack.c:94 [inline]\n    dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n    print_address_description mm/kasan/report.c:408 [inline]\n    print_report+0xc3/0x670 mm/kasan/report.c:521\n    kasan_report+0xe0/0x110 mm/kasan/report.c:634\n    iov_iter_revert lib/iov_iter.c:633 [inline]\n    iov_iter_revert+0x443/0x5a0 lib/iov_iter.c:611\n    netfs_retry_write_stream fs/netfs/write_retry.c:44 [inline]\n    netfs_retry_writes+0x166d/0x1a50 fs/netfs/write_retry.c:231\n    netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]\n    netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374\n    process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238\n    process_scheduled_works kernel/workqueue.c:3319 [inline]\n    worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400\n    kthread+0x3c2/0x780 kernel/kthread.c:464\n    ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153\n    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n    </TASK>"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfs: Se corrige un error en el reintento de escritura debido al restablecimiento incorrecto del iterador de la subsolicitud. Se corrige el restablecimiento del iterador de la subsolicitud en netfs_retry_write_stream() para usar la función iterator-reset, ya que el iterador podría haberse acortado debido a un reintento anterior. En tal caso, la cantidad de datos que debe escribir la subsolicitud no es \"subreq-&gt;len\", sino \"subreq-&gt;len - subreq-&gt;transferred\". Sin esto, KASAN puede ver un error en iov_iter_revert(): ERROR: KASAN: slab-out-of-bounds en iov_iter_revert lib/iov_iter.c:633 [en línea] ERROR: KASAN: slab-out-of-bounds en iov_iter_revert+0x443/0x5a0 lib/iov_iter.c:611 Lectura de tamaño 4 en la dirección ffff88802912a0b8 por la tarea kworker/u32:7/1147 CPU: 1 UID: 0 PID: 1147 Comm: kworker/u32:7 No contaminado 6.15.0-rc6-syzkaller-00052-g9f35e33144ae #0 PREEMPT(full) Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 01/04/2014 Cola de trabajo: events_unbound netfs_write_collection_worker Rastreo de llamadas  __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 iov_iter_revert lib/iov_iter.c:633 [inline] iov_iter_revert+0x443/0x5a0 lib/iov_iter.c:611 netfs_retry_write_stream fs/netfs/write_retry.c:44 [inline] netfs_retry_writes+0x166d/0x1a50 fs/netfs/write_retry.c:231 netfs_collect_write_results fs/netfs/write_collect.c:352 [inline] netfs_write_collection_worker+0x23fd/0x3830 fs/netfs/write_collect.c:374 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c2/0x780 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245  "
    }
  ],
  "lastModified": "2026-07-30T06:22:54.727",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F15EFAD5-C9E3-4C87-9DC6-6867D90AAB3A",
              "versionEndExcluding": "6.12.37",
              "versionStartIncluding": "6.12"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0541C761-BD5E-4C1A-8432-83B375D7EB92",
              "versionEndExcluding": "6.15.3",
              "versionStartIncluding": "6.13"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}