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CVE-2025-71161

Estado: ModificadaMedia (5.5)—

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

dm-verity: disable recursive forward error correction

There are two problems with the recursive correction:

1. It may cause denial-of-service. In fec_read_bufs, there is a loop that has 253 iterations. For each iteration, we may call verity_hash_for_block recursively. There is a limit of 4 nested recursions - that means that there may be at most 253^4 (4 billion) iterations. Red Hat QE team actually created an image that pushes dm-verity to this limit - and this image just makes the udev-worker process get stuck in the 'D' state.

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2. It doesn't work. In fec_read_bufs we store data into the variable "fio->bufs", but fio bufs is shared between recursive invocations, if "verity_hash_for_block" invoked correction recursively, it would overwrite partially filled fio->bufs.

CVSS

Probabilidad de explotación (EPSS)

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

Referencias

JSON original (NVD)

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  "id": "CVE-2025-71161",
  "cveTags": [],
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-verity: disable recursive forward error correction\n\nThere are two problems with the recursive correction:\n\n1. It may cause denial-of-service. In fec_read_bufs, there is a loop that\nhas 253 iterations. For each iteration, we may call verity_hash_for_block\nrecursively. There is a limit of 4 nested recursions - that means that\nthere may be at most 253^4 (4 billion) iterations. Red Hat QE team\nactually created an image that pushes dm-verity to this limit - and this\nimage just makes the udev-worker process get stuck in the 'D' state.\n\n2. It doesn't work. In fec_read_bufs we store data into the variable\n\"fio->bufs\", but fio bufs is shared between recursive invocations, if\n\"verity_hash_for_block\" invoked correction recursively, it would\noverwrite partially filled fio->bufs."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndm-verity: deshabilitar la corrección de errores hacia adelante recursiva\n\nHay dos problemas con la corrección recursiva:\n\n1. Puede causar una denegación de servicio. En fec_read_bufs, hay un bucle que tiene 253 iteraciones. Para cada iteración, podemos llamar a verity_hash_for_block recursivamente. Hay un límite de 4 recursiones anidadas, lo que significa que puede haber como máximo 253^4 (4 mil millones) iteraciones. El equipo de QE de Red Hat creó una imagen que lleva a dm-verity a este límite, y esta imagen simplemente hace que el proceso udev-worker se quede atascado en el estado 'D'.\n\n2. No funciona. En fec_read_bufs almacenamos datos en la variable 'fio->bufs', pero fio bufs se comparte entre invocaciones recursivas; si 'verity_hash_for_block' invocara la corrección recursivamente, sobrescribiría los fio->bufs parcialmente llenos."
    }
  ],
  "lastModified": "2026-07-30T06:24:55.107",
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}