« Volver al listado

CVE-2026-64562

Estado: RecibidaAlta (8.8)—

In the Linux kernel, the following vulnerability has been resolved:

KVM: nVMX: Hide shadow VMCS right after VMCLEAR

free_nested() frees the shadow VMCS while vmcs01 still points to it. But because it is asynchronous with respect to loaded_vmcs_clear(), the vCPU might migrate before the pointer is cleared and __loaded_vmcs_clear() may then execute VMCLEAR.

The VMCS needs to stay attached until its explicit VMCLEAR completes, but then it can be hidden and the page safely freed.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad local en kernel Linux con PR:L (requiere privilegios usuario). free_nested() / VMCLEAR en KVM permite escalada o ejecución en contexto privilegiado. Denuncio T1499.004 (DoS recurso) por riesgo de race condition y cuelgue.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network Traffic

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-64562",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 2
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
              "lessThan": "b82c3144d8264265448292ca406f60bafeba3b6f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
              "lessThan": "4f50e6aec16f69627dbad5704d1e90a255d766a7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
              "lessThan": "dc3eecfa219ebc9d01eaf7d1abd1441efe884dab",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
              "lessThan": "af56298e9d86e6098cd1d2e155cb2949b7c45412",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
              "lessThan": "589419470030a89f16cf19300658b6dc644ca946",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
              "lessThan": "8001d2ce9d9bd09118ce523aef595aa094573ae3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
              "lessThan": "1dabef6e206568bf9d9ade74f6e56a48ea35695d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
              "lessThan": "622ebfac01ba4f9c0060cebd41257fe46fc4a0b3",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "arch/x86/kvm/vmx/nested.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.9",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/x86/kvm/vmx/nested.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-04T07:16:31.093",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1dabef6e206568bf9d9ade74f6e56a48ea35695d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4f50e6aec16f69627dbad5704d1e90a255d766a7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/589419470030a89f16cf19300658b6dc644ca946",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/622ebfac01ba4f9c0060cebd41257fe46fc4a0b3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8001d2ce9d9bd09118ce523aef595aa094573ae3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/af56298e9d86e6098cd1d2e155cb2949b7c45412",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b82c3144d8264265448292ca406f60bafeba3b6f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dc3eecfa219ebc9d01eaf7d1abd1441efe884dab",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nVMX: Hide shadow VMCS right after VMCLEAR\n\nfree_nested() frees the shadow VMCS while vmcs01 still points to it. But\nbecause it is asynchronous with respect to loaded_vmcs_clear(), the vCPU\nmight migrate before the pointer is cleared and __loaded_vmcs_clear()\nmay then execute VMCLEAR.\n\nThe VMCS needs to stay attached until its explicit VMCLEAR completes, but\nthen it can be hidden and the page safely freed."
    }
  ],
  "lastModified": "2026-08-19T17:20:15.970",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}