{
  "id": "CVE-2025-21851",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-03-12T10:15:17.703",
  "lastModified": "2025-03-13T16:29:50.380",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix softlockup in arena_map_free on 64k page kernel\n\nOn an aarch64 kernel with CONFIG_PAGE_SIZE_64KB=y,\narena_htab tests cause a segmentation fault and soft lockup.\nThe same failure is not observed with 4k pages on aarch64.\n\nIt turns out arena_map_free() is calling\napply_to_existing_page_range() with the address returned by\nbpf_arena_get_kern_vm_start().  If this address is not page-aligned\nthe code ends up calling apply_to_pte_range() with that unaligned\naddress causing soft lockup.\n\nFix it by round up GUARD_SZ to PAGE_SIZE << 1 so that the\ndivision by 2 in bpf_arena_get_kern_vm_start() returns\na page-aligned value."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Arregla el bloqueo suave en arena_map_free en un kernel de p\u00e1gina de 64k En un kernel aarch64 con CONFIG_PAGE_SIZE_64KB=y, las pruebas arena_htab causan un fallo de segmentaci\u00f3n y un bloqueo suave. No se observa el mismo fallo con p\u00e1ginas de 4k en aarch64. Resulta que arena_map_free() est\u00e1 llamando a apply_to_existing_page_range() con la direcci\u00f3n devuelta por bpf_arena_get_kern_vm_start(). Si esta direcci\u00f3n no est\u00e1 alineada con la p\u00e1gina, el c\u00f3digo termina llamando a apply_to_pte_range() con esa direcci\u00f3n no alineada, lo que causa un bloqueo suave. Arr\u00e9glelo redondeando GUARD_SZ a PAGE_SIZE &lt;&lt; 1 para que la divisi\u00f3n por 2 en bpf_arena_get_kern_vm_start() devuelva un valor alineado con la p\u00e1gina."
    }
  ],
  "metrics": {
    "cvssMetricV31": [
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        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
          "baseScore": 3.3,
          "baseSeverity": "LOW",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 1.4
      }
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  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ]
    }
  ],
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  "references": [
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      "url": "https://git.kernel.org/stable/c/517e8a7835e8cfb398a0aeb0133de50e31cae32b",
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