fkie_cve-2021-47368
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2025-04-02 14:53
Severity ?
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: enetc: Fix illegal access when reading affinity_hint irq_set_affinity_hit() stores a reference to the cpumask_t parameter in the irq descriptor, and that reference can be accessed later from irq_affinity_hint_proc_show(). Since the cpu_mask parameter passed to irq_set_affinity_hit() has only temporary storage (it's on the stack memory), later accesses to it are illegal. Thus reads from the corresponding procfs affinity_hint file can result in paging request oops. The issue is fixed by the get_cpu_mask() helper, which provides a permanent storage for the cpumask_t parameter.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c4c3052911b577920353a7646e4883d5da40c28Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4c4c3052911b577920353a7646e4883d5da40c28Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "matchCriteriaId": "6C41E865-07A4-4D63-A20A-0BB6C0451FB2",
              "versionEndExcluding": "5.4.150",
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          "negate": false,
          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nenetc: Fix illegal access when reading affinity_hint\n\nirq_set_affinity_hit() stores a reference to the cpumask_t\nparameter in the irq descriptor, and that reference can be\naccessed later from irq_affinity_hint_proc_show(). Since\nthe cpu_mask parameter passed to irq_set_affinity_hit() has\nonly temporary storage (it\u0027s on the stack memory), later\naccesses to it are illegal. Thus reads from the corresponding\nprocfs affinity_hint file can result in paging request oops.\n\nThe issue is fixed by the get_cpu_mask() helper, which provides\na permanent storage for the cpumask_t parameter."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: enetc: corrige el acceso ilegal al leer affinity_hint irq_set_affinity_hit() almacena una referencia al par\u00e1metro cpumask_t en el descriptor irq, y se puede acceder a esa referencia m\u00e1s tarde desde irq_affinity_hint_proc_show(). Dado que el par\u00e1metro cpu_mask pasado a irq_set_affinity_hit() solo tiene almacenamiento temporal (est\u00e1 en la memoria de la pila), los accesos posteriores a \u00e9l son ilegales. Por lo tanto, las lecturas del archivo procfs affinity_hint correspondiente pueden dar como resultado una solicitud de paginaci\u00f3n. El problema lo soluciona el asistente get_cpu_mask(), que proporciona un almacenamiento permanente para el par\u00e1metro cpumask_t."
    }
  ],
  "id": "CVE-2021-47368",
  "lastModified": "2025-04-02T14:53:33.090",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
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  "published": "2024-05-21T15:15:22.773",
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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