fkie_cve-2022-48890
Vulnerability from fkie_nvd
Published
2024-08-21 07:15
Modified
2024-09-06 15:11
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: scsi: storvsc: Fix swiotlb bounce buffer leak in confidential VM storvsc_queuecommand() maps the scatter/gather list using scsi_dma_map(), which in a confidential VM allocates swiotlb bounce buffers. If the I/O submission fails in storvsc_do_io(), the I/O is typically retried by higher level code, but the bounce buffer memory is never freed. The mostly like cause of I/O submission failure is a full VMBus channel ring buffer, which is not uncommon under high I/O loads. Eventually enough bounce buffer memory leaks that the confidential VM can't do any I/O. The same problem can arise in a non-confidential VM with kernel boot parameter swiotlb=force. Fix this by doing scsi_dma_unmap() in the case of an I/O submission error, which frees the bounce buffer memory.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67ff3d0a49f3d445c3922e30a54e03c161da561ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/87c71e88f6a6619ffb1ff88f84dff48ef6d57adbPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.2
linux linux_kernel 6.2
linux linux_kernel 6.2


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
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              "matchCriteriaId": "96403C94-C711-476F-BE5F-C7510379207B",
              "versionEndExcluding": "6.1.7",
              "versionStartIncluding": "5.17",
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          "operator": "OR"
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: storvsc: Fix swiotlb bounce buffer leak in confidential VM\n\nstorvsc_queuecommand() maps the scatter/gather list using scsi_dma_map(),\nwhich in a confidential VM allocates swiotlb bounce buffers. If the I/O\nsubmission fails in storvsc_do_io(), the I/O is typically retried by higher\nlevel code, but the bounce buffer memory is never freed.  The mostly like\ncause of I/O submission failure is a full VMBus channel ring buffer, which\nis not uncommon under high I/O loads.  Eventually enough bounce buffer\nmemory leaks that the confidential VM can\u0027t do any I/O. The same problem\ncan arise in a non-confidential VM with kernel boot parameter\nswiotlb=force.\n\nFix this by doing scsi_dma_unmap() in the case of an I/O submission\nerror, which frees the bounce buffer memory."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: scsi: storvsc: corrige la fuga del b\u00fafer de rebote swiotlb en una VM confidencial storvsc_queuecommand() asigna la lista de dispersi\u00f3n/recopilaci\u00f3n usando scsi_dma_map(), que en una VM confidencial asigna buffers de rebote swiotlb. Si el env\u00edo de E/S falla en storvsc_do_io(), la E/S normalmente se reintenta mediante c\u00f3digo de nivel superior, pero la memoria del b\u00fafer de rebote nunca se libera. La causa m\u00e1s com\u00fan de falla en el env\u00edo de E/S es un b\u00fafer de anillo de canal VMBus lleno, lo cual no es infrecuente bajo cargas de E/S elevadas. Con el tiempo, se pierden suficientes memorias del b\u00fafer de rebote como para que la m\u00e1quina virtual confidencial no pueda realizar ninguna E/S. El mismo problema puede surgir en una m\u00e1quina virtual no confidencial con el par\u00e1metro de arranque del kernel swiotlb=force. Solucione este problema haciendo scsi_dma_unmap() en el caso de un error de env\u00edo de E/S, lo que libera la memoria del b\u00fafer de rebote."
    }
  ],
  "id": "CVE-2022-48890",
  "lastModified": "2024-09-06T15:11:16.120",
  "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": "2024-08-21T07:15:05.303",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/67ff3d0a49f3d445c3922e30a54e03c161da561e"
    },
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-401"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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