{
  "id": "CVE-2024-42161",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-07-30T08:15:07.447",
  "lastModified": "2024-09-25T15:54:47.837",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD\n\n[Changes from V1:\n - Use a default branch in the switch statement to initialize `val'.]\n\nGCC warns that `val' may be used uninitialized in the\nBPF_CRE_READ_BITFIELD macro, defined in bpf_core_read.h as:\n\n\t[...]\n\tunsigned long long val;\t\t\t\t\t\t      \\\n\t[...]\t\t\t\t\t\t\t\t      \\\n\tswitch (__CORE_RELO(s, field, BYTE_SIZE)) {\t\t\t      \\\n\tcase 1: val = *(const unsigned char *)p; break;\t\t\t      \\\n\tcase 2: val = *(const unsigned short *)p; break;\t\t      \\\n\tcase 4: val = *(const unsigned int *)p; break;\t\t\t      \\\n\tcase 8: val = *(const unsigned long long *)p; break;\t\t      \\\n        }       \t\t\t\t\t\t\t      \\\n\t[...]\n\tval;\t\t\t\t\t\t\t\t      \\\n\t}\t\t\t\t\t\t\t\t      \\\n\nThis patch adds a default entry in the switch statement that sets\n`val' to zero in order to avoid the warning, and random values to be\nused in case __builtin_preserve_field_info returns unexpected values\nfor BPF_FIELD_BYTE_SIZE.\n\nTested in bpf-next master.\nNo regressions."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Evite el valor no inicializado en BPF_CORE_READ_BITFIELD [Cambios desde V1: - Use una rama predeterminada en la instrucci\u00f3n switch para inicializar `val'.] GCC advierte que `val' puede usarse sin inicializar en la macro BPF_CRE_READ_BITFIELD, definida en bpf_core_read.h como: [...] unsigned long long val; \\ [...] \\ switch (__CORE_RELO(s, campo, BYTE_SIZE)) { \\ case  1: val = *(const unsigned char *)p; break; \\ case 2: val = *(const unsigned short *)p; break; \\ case 4: val = *(const unsigned int *)p; romper; \\ case 8: val = *(const unsigned long long *)p; break; \\ } \\ [...] val; \\ } \\ Este parche agrega una entrada predeterminada en la declaraci\u00f3n de cambio que establece `val' en cero para evitar la advertencia, y valores aleatorios que se usar\u00e1n en caso de que __builtin_preserve_field_info devuelva valores inesperados para BPF_FIELD_BYTE_SIZE. Probado en bpf-next master. Sin regresiones."
    }
  ],
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        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "HIGH",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM"
        },
        "exploitabilityScore": 0.8,
        "impactScore": 5.5
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  "weaknesses": [
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      "type": "Primary",
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          "value": "CWE-908"
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