FKIE_CVE-2025-68771

Vulnerability from fkie_nvd - Published: 2026-01-13 16:15 - Updated: 2026-04-15 00:35
Severity
Summary
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) 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/039bef30e320827bac8990c9f29d2a68cd8adb5f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1f77e5cd563e6387fdf3bb714fcda36cd88ac5e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7acc0390e0dd7474c4451d05465a677d55ad4268
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/96f1b074c98c20f55a3b23d2ab44d9fb0f619869
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b08a33d5f80efe6979a6e8f905c1a898910c21dd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d0fd1f732ea8063cecd07a3879b7d815c7ee71ed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e24aedae71652d4119049f1fbef6532ccbe3966d
Impacted products
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{
  "cveTags": [],
  "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-\u003ecl_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 inform\u00f3 un BUG del kernel en ocfs2_find_victim_chain() porque el campo \u0027cl_next_free_rec\u0027 de la lista de cadenas de asignaci\u00f3n (siguiente ranura libre en la lista de cadenas) es 0, lo que activa la condici\u00f3n BUG_ON(!cl-\u0026gt;cl_next_free_rec) en ocfs2_find_victim_chain() y provoca un p\u00e1nico en el kernel.\n\nPara solucionar esto, se introduce una condici\u00f3n \u0027if\u0027 en ocfs2_claim_suballoc_bits(), justo antes de llamar a ocfs2_find_victim_chain(), ejecut\u00e1ndose el bloque de c\u00f3digo dentro de ella cuando cualquiera de las siguientes condiciones es verdadera:\n\n1. \u0027cl_next_free_rec\u0027 es igual a 0, lo que indica que no hay cadenas libres en la lista de cadenas de asignaci\u00f3n\n2. \u0027cl_next_free_rec\u0027 es mayor que \u0027cl_count\u0027 (el n\u00famero total de cadenas en la lista de cadenas de asignaci\u00f3n)\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 depuraci\u00f3n, en lugar de provocar un p\u00e1nico en el kernel."
    }
  ],
  "id": "CVE-2025-68771",
  "lastModified": "2026-04-15T00:35:42.020",
  "metrics": {},
  "published": "2026-01-13T16:15:56.590",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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