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CVE-2025-68771

Estado: AplazadaSin puntuar—

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

ocfs2: fix kernel BUG in ocfs2_find_victim_chain

syzbot reported a kernel BUG in ocfs2_find_victim_chain() because the `cl_next_free_rec` field of the allocation chain list (next free slot in the chain list) is 0, triggring the BUG_ON(!cl->cl_next_free_rec) condition in ocfs2_find_victim_chain() and panicking the kernel.

To fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(), just before calling ocfs2_find_victim_chain(), the code block in it being executed when either of the following conditions is true:

1. `cl_next_free_rec` is equal to 0, indicating that there are no free chains in the allocation chain list 2. `cl_next_free_rec` is greater than `cl_count` (the total number of chains in the allocation chain list)

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Either of them being true is indicative of the fact that there are no chains left for usage.

This is addressed using ocfs2_error(), which prints the error log for debugging purposes, rather than panicking the kernel.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-68771",
  "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": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "lessThan": "1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "lessThan": "d0fd1f732ea8063cecd07a3879b7d815c7ee71ed",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "lessThan": "b08a33d5f80efe6979a6e8f905c1a898910c21dd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "lessThan": "96f1b074c98c20f55a3b23d2ab44d9fb0f619869",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "lessThan": "e24aedae71652d4119049f1fbef6532ccbe3966d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "lessThan": "7acc0390e0dd7474c4451d05465a677d55ad4268",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ccd979bdbce9fba8412beb3f1de68a9d0171b12c",
              "lessThan": "039bef30e320827bac8990c9f29d2a68cd8adb5f",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/ocfs2/suballoc.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.16"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.16",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.248",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.160",
              "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/ocfs2/suballoc.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-01-13T16:15:56.590",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/039bef30e320827bac8990c9f29d2a68cd8adb5f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7acc0390e0dd7474c4451d05465a677d55ad4268",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/96f1b074c98c20f55a3b23d2ab44d9fb0f619869",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b08a33d5f80efe6979a6e8f905c1a898910c21dd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d0fd1f732ea8063cecd07a3879b7d815c7ee71ed",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e24aedae71652d4119049f1fbef6532ccbe3966d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix kernel BUG in ocfs2_find_victim_chain\n\nsyzbot reported a kernel BUG in ocfs2_find_victim_chain() because the\n`cl_next_free_rec` field of the allocation chain list (next free slot in\nthe chain list) is 0, triggring the BUG_ON(!cl->cl_next_free_rec)\ncondition in ocfs2_find_victim_chain() and panicking the kernel.\n\nTo fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(),\njust before calling ocfs2_find_victim_chain(), the code block in it being\nexecuted when either of the following conditions is true:\n\n1. `cl_next_free_rec` is equal to 0, indicating that there are no free\nchains in the allocation chain list\n2. `cl_next_free_rec` is greater than `cl_count` (the total number of\nchains in the allocation chain list)\n\nEither of them being true is indicative of the fact that there are no\nchains left for usage.\n\nThis is addressed using ocfs2_error(), which prints\nthe error log for debugging purposes, rather than panicking the kernel."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nocfs2: corrige un BUG del kernel en ocfs2_find_victim_chain\n\nsyzbot informó un BUG del kernel en ocfs2_find_victim_chain() porque el campo 'cl_next_free_rec' de la lista de cadenas de asignación (siguiente ranura libre en la lista de cadenas) es 0, lo que activa la condición BUG_ON(!cl->cl_next_free_rec) en ocfs2_find_victim_chain() y provoca un pánico en el kernel.\n\nPara solucionar esto, se introduce una condición 'if' en ocfs2_claim_suballoc_bits(), justo antes de llamar a ocfs2_find_victim_chain(), ejecutándose el bloque de código dentro de ella cuando cualquiera de las siguientes condiciones es verdadera:\n\n1. 'cl_next_free_rec' es igual a 0, lo que indica que no hay cadenas libres en la lista de cadenas de asignación\n2. 'cl_next_free_rec' es mayor que 'cl_count' (el número total de cadenas en la lista de cadenas de asignación)\n\nQue cualquiera de ellas sea verdadera es indicativo del hecho de que no quedan cadenas para su uso.\n\nEsto se aborda utilizando ocfs2_error(), que imprime el registro de errores para fines de depuración, en lugar de provocar un pánico en el kernel."
    }
  ],
  "lastModified": "2026-06-17T09:59:33.620",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}