fkie_cve-2024-45020
Vulnerability from fkie_nvd
Published
2024-09-11 16:15
Modified
2024-09-13 16:36
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a kernel verifier crash in stacksafe() Daniel Hodges reported a kernel verifier crash when playing with sched-ext. Further investigation shows that the crash is due to invalid memory access in stacksafe(). More specifically, it is the following code: if (exact != NOT_EXACT && old->stack[spi].slot_type[i % BPF_REG_SIZE] != cur->stack[spi].slot_type[i % BPF_REG_SIZE]) return false; The 'i' iterates old->allocated_stack. If cur->allocated_stack < old->allocated_stack the out-of-bound access will happen. To fix the issue add 'i >= cur->allocated_stack' check such that if the condition is true, stacksafe() should fail. Otherwise, cur->stack[spi].slot_type[i % BPF_REG_SIZE] memory access is legal.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6e3987ac310c74bb4dd6a2fa8e46702fe505fb2bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7cad3174cc79519bf5f6c4441780264416822c08Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bed2eb964c70b780fb55925892a74f26cb590b25Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.11
linux linux_kernel 6.11
linux linux_kernel 6.11


To clipboard 

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  "configurations": [
    {
      "nodes": [
        {
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  "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 \u0026\u0026\n        old-\u003estack[spi].slot_type[i % BPF_REG_SIZE] !=\n        cur-\u003estack[spi].slot_type[i % BPF_REG_SIZE])\n            return false;\n\nThe \u0027i\u0027 iterates old-\u003eallocated_stack.\nIf cur-\u003eallocated_stack \u003c old-\u003eallocated_stack the out-of-bound\naccess will happen.\n\nTo fix the issue add \u0027i \u003e= cur-\u003eallocated_stack\u0027 check such that if\nthe condition is true, stacksafe() should fail. Otherwise,\ncur-\u003estack[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 \u0026amp;\u0026amp; old-\u0026gt;stack[spi].slot_type[i % BPF_REG_SIZE] != cur-\u0026gt;stack[spi].slot_type[i % BPF_REG_SIZE]) return false; La \u0027i\u0027 itera old-\u0026gt;allocated_stack. Si cur-\u0026gt;allocated_stack \u0026lt; old-\u0026gt;allocated_stack, se producir\u00e1 el acceso fuera de l\u00edmites. Para solucionar el problema, agregue la comprobaci\u00f3n \u0027i \u0026gt;= cur-\u0026gt;allocated_stack\u0027 de modo que, si la condici\u00f3n es verdadera, stacksafe() deber\u00eda fallar. De lo contrario, el acceso a la memoria cur-\u0026gt;stack[spi].slot_type[i % BPF_REG_SIZE] es legal."
    }
  ],
  "id": "CVE-2024-45020",
  "lastModified": "2024-09-13T16:36:52.290",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-09-11T16:15:07.050",
  "references": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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