fkie_cve-2021-47389
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2025-04-02 14:52
Severity ?
5.1 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: fix missing sev_decommission in sev_receive_start DECOMMISSION the current SEV context if binding an ASID fails after RECEIVE_START. Per AMD's SEV API, RECEIVE_START generates a new guest context and thus needs to be paired with DECOMMISSION: The RECEIVE_START command is the only command other than the LAUNCH_START command that generates a new guest context and guest handle. The missing DECOMMISSION can result in subsequent SEV launch failures, as the firmware leaks memory and might not able to allocate more SEV guest contexts in the future. Note, LAUNCH_START suffered the same bug, but was previously fixed by commit 934002cd660b ("KVM: SVM: Call SEV Guest Decommission if ASID binding fails").
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1815e0aa770f2127c5df31eb5c2f0e37b60fa77Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f1815e0aa770f2127c5df31eb5c2f0e37b60fa77Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "F568C3FC-1C1C-4E75-A84A-6AC89AF20681",
              "versionEndExcluding": "5.14.10",
              "versionStartIncluding": "5.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644",
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            },
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          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: fix missing sev_decommission in sev_receive_start\n\nDECOMMISSION the current SEV context if binding an ASID fails after\nRECEIVE_START.  Per AMD\u0027s SEV API, RECEIVE_START generates a new guest\ncontext and thus needs to be paired with DECOMMISSION:\n\n     The RECEIVE_START command is the only command other than the LAUNCH_START\n     command that generates a new guest context and guest handle.\n\nThe missing DECOMMISSION can result in subsequent SEV launch failures,\nas the firmware leaks memory and might not able to allocate more SEV\nguest contexts in the future.\n\nNote, LAUNCH_START suffered the same bug, but was previously fixed by\ncommit 934002cd660b (\"KVM: SVM: Call SEV Guest Decommission if ASID\nbinding fails\")."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: SVM: corrige la falta de sev_decommission en sev_receive_start DESCOMMISSION el contexto SEV actual si falla la vinculaci\u00f3n de un ASID despu\u00e9s de RECEIVE_START. Seg\u00fan la API SEV de AMD, RECEIVE_START genera un nuevo contexto de invitado y, por lo tanto, debe combinarse con DECOMMISSION: el comando RECEIVE_START es el \u00fanico comando, adem\u00e1s del comando LAUNCH_START, que genera un nuevo contexto de invitado y un identificador de invitado. La DESCOMISI\u00d3N faltante puede provocar fallas de inicio de SEV posteriores, ya que el firmware pierde memoria y es posible que no pueda asignar m\u00e1s contextos de invitados de SEV en el futuro. Tenga en cuenta que LAUNCH_START sufri\u00f3 el mismo error, pero se solucion\u00f3 previamente mediante la confirmaci\u00f3n 934002cd660b (\"KVM: SVM: llame a SEV Guest Decommission si falla el enlace ASID\")."
    }
  ],
  "id": "CVE-2021-47389",
  "lastModified": "2025-04-02T14:52:16.460",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "LOW",
          "baseScore": 5.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 2.5,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2024-05-21T15:15:24.330",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/efd7866e114dcb44f86d151e843f8276b7efbc67"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "tags": [
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    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-772"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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