FKIE_CVE-2022-48793

Vulnerability from fkie_nvd - Published: 2024-07-16 12:15 - Updated: 2024-11-21 07:34
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: KVM: x86: nSVM: fix potential NULL derefernce on nested migration Turns out that due to review feedback and/or rebases I accidentally moved the call to nested_svm_load_cr3 to be too early, before the NPT is enabled, which is very wrong to do. KVM can't even access guest memory at that point as nested NPT is needed for that, and of course it won't initialize the walk_mmu, which is main issue the patch was addressing. Fix this for real.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/352193edda48e08e8824a7ece09aec830a603cfePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/74b426bea4f7e3b081add2b88d4fba16d3af7ab6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e1779c2714c3023e4629825762bcbc43a3b943dfPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/352193edda48e08e8824a7ece09aec830a603cfePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/74b426bea4f7e3b081add2b88d4fba16d3af7ab6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e1779c2714c3023e4629825762bcbc43a3b943dfPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "6467CE52-5FC4-4C7B-A594-75503B1F51B0",
              "versionEndExcluding": "5.15.25",
              "versionStartIncluding": "5.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0D327234-5D4A-43DC-A6DF-BCA0CEBEC039",
              "versionEndExcluding": "5.16.11",
              "versionStartIncluding": "5.16",
              "vulnerable": true
            }
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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\nKVM: x86: nSVM: fix potential NULL derefernce on nested migration\n\nTurns out that due to review feedback and/or rebases\nI accidentally moved the call to nested_svm_load_cr3 to be too early,\nbefore the NPT is enabled, which is very wrong to do.\n\nKVM can\u0027t even access guest memory at that point as nested NPT\nis needed for that, and of course it won\u0027t initialize the walk_mmu,\nwhich is main issue the patch was addressing.\n\nFix this for real."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: KVM: x86: nSVM: corrige una posible desreferencia NULL en la migraci\u00f3n anidada Resulta que, debido a los comentarios de revisi\u00f3n y/o cambios de base, accidentalmente mov\u00ed la llamada a nested_svm_load_cr3 para que fuera demasiado pronto, antes de NPT est\u00e1 habilitado, lo cual es muy incorrecto. KVM ni siquiera puede acceder a la memoria del invitado en ese momento, ya que para eso se necesita NPT anidado y, por supuesto, no inicializar\u00e1 walk_mmu, que es el principal problema que solucionaba el parche. Arregla esto de verdad."
    }
  ],
  "id": "CVE-2022-48793",
  "lastModified": "2024-11-21T07:34:02.187",
  "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": "2024-07-16T12:15:04.067",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/352193edda48e08e8824a7ece09aec830a603cfe"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    },
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      "tags": [
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/352193edda48e08e8824a7ece09aec830a603cfe"
    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/74b426bea4f7e3b081add2b88d4fba16d3af7ab6"
    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/e1779c2714c3023e4629825762bcbc43a3b943df"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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