{
  "id": "CVE-2024-45020",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-09-11T16:15:07.050",
  "lastModified": "2024-09-13T16:36:52.290",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix a kernel verifier crash in stacksafe()\n\nDaniel Hodges reported a kernel verifier crash when playing with sched-ext.\nFurther investigation shows that the crash is due to invalid memory access\nin stacksafe(). More specifically, it is the following code:\n\n    if (exact != NOT_EXACT &&\n        old->stack[spi].slot_type[i % BPF_REG_SIZE] !=\n        cur->stack[spi].slot_type[i % BPF_REG_SIZE])\n            return false;\n\nThe 'i' iterates old->allocated_stack.\nIf cur->allocated_stack < old->allocated_stack the out-of-bound\naccess will happen.\n\nTo fix the issue add 'i >= cur->allocated_stack' check such that if\nthe condition is true, stacksafe() should fail. Otherwise,\ncur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Se corrige un fallo del verificador del kernel en stacksafe() Daniel Hodges inform\u00f3 de un fallo del verificador del kernel al jugar con sched-ext. Una investigaci\u00f3n m\u00e1s profunda muestra que el fallo se debe a un acceso a memoria no v\u00e1lido en stacksafe(). M\u00e1s espec\u00edficamente, es el siguiente c\u00f3digo: if (exact != NOT_EXACT &amp;&amp; old-&gt;stack[spi].slot_type[i % BPF_REG_SIZE] != cur-&gt;stack[spi].slot_type[i % BPF_REG_SIZE]) return false; La 'i' itera old-&gt;allocated_stack. Si cur-&gt;allocated_stack &lt; old-&gt;allocated_stack, se producir\u00e1 el acceso fuera de l\u00edmites. Para solucionar el problema, agregue la comprobaci\u00f3n 'i &gt;= cur-&gt;allocated_stack' de modo que, si la condici\u00f3n es verdadera, stacksafe() deber\u00eda fallar. De lo contrario, el acceso a la memoria cur-&gt;stack[spi].slot_type[i % BPF_REG_SIZE] es legal."
    }
  ],
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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:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
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  "weaknesses": [
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      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
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          "value": "CWE-787"
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