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CVE-2026-89929

Estado: RecibidaAlta (8.8)—

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

KVM: nVM: Ensure INVVPID is emulated on the correct physical CPU

When emulating INVVPID, KVM executes INVVPID on the physical CPU using vpid02 (instead of the L1 assigned VPID), after doing some validations on the operands. However, it is possible that the physical CPU KVM executes INVVPID on is different from the CPU L2 is running on.

For example, in the following scenario: - L2 runs on CPU #1 and exits to L1 (vmx->nested.vmcs02.cpu=1) - L1 migrates to CPU #2 and executes INVVPID - KVM executes INVVPID on CPU #2 - L1 migrates back to CPU #1 and runs L2 (vmx->nested.vmcs02.cpu=1)

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The TLB entries on CPU #1 are never invalidated, because INVVPID was executed on CPU #2, and vmcs02 never ran on a different pCPU (i.e. vmx_vcpu_load_vmcs() will *not* request KVM_REQ_TLB_FLUSH).

Ensure that INVVPID is being executed on the same pCPU that L2 last ran on, and if not, fallback to clearing last_vpid=0 to trigger a full VPID flush on the next nested VM-Enter (as KVM will detect L1 using a different VPID for L2). If L2 ends up running on a different pCPU, KVM will flush the TLB anyway through vmx_vcpu_load_vmcs().

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 en KVM que permite a un atacante local con privilegios (PR:L) eludir validaciones de INVVPID y causar invalidación incorrecta de TLB, afectando aislamiento de máquinas virtuales.

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

Threat Intelligence ProgramPrivileged Account ManagementFilter Network TrafficExecution PreventionBehavior Prevention on EndpointApplication Isolation and Sandboxing

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)

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{
  "id": "CVE-2026-89929",
  "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": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
              "lessThan": "d03e721801ac54b9fdf05668aa0c069f07913b68",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
              "lessThan": "27bdeb5fd19046ffba9ff234e92fe553eb2efb30",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
              "lessThan": "9941850e8adf164d005dbd3774c4b79e91a3cb8e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5c614b3583e7b6dab0c86356fa36c2bcbb8322a0",
              "lessThan": "6d00e67326d831e6e610933a3800712f4ffe6ec1",
              "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": "4.4"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.4",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/x86/kvm/vmx/nested.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-16T11:17:02.180",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/27bdeb5fd19046ffba9ff234e92fe553eb2efb30",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6d00e67326d831e6e610933a3800712f4ffe6ec1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9941850e8adf164d005dbd3774c4b79e91a3cb8e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d03e721801ac54b9fdf05668aa0c069f07913b68",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nVM: Ensure INVVPID is emulated on the correct physical CPU\n\nWhen emulating INVVPID, KVM executes INVVPID on the physical CPU using\nvpid02 (instead of the L1 assigned VPID), after doing some validations\non the operands. However, it is possible that the physical CPU KVM\nexecutes INVVPID on is different from the CPU L2 is running on.\n\nFor example, in the following scenario:\n- L2 runs on CPU #1 and exits to L1 (vmx->nested.vmcs02.cpu=1)\n- L1 migrates to CPU #2 and executes INVVPID\n- KVM executes INVVPID on CPU #2\n- L1 migrates back to CPU #1 and runs L2 (vmx->nested.vmcs02.cpu=1)\n\nThe TLB entries on CPU #1 are never invalidated, because INVVPID was\nexecuted on CPU #2, and vmcs02 never ran on a different pCPU (i.e.\nvmx_vcpu_load_vmcs() will *not* request KVM_REQ_TLB_FLUSH).\n\nEnsure that INVVPID is being executed on the same pCPU that L2 last ran\non, and if not, fallback to clearing last_vpid=0 to trigger a full VPID\nflush on the next nested VM-Enter (as KVM will detect L1 using a\ndifferent VPID for L2). If L2 ends up running on a different pCPU, KVM\nwill flush the TLB anyway through vmx_vcpu_load_vmcs()."
    }
  ],
  "lastModified": "2026-09-17T10:17:04.940",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}