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CVE-2022-33745

Estado: ModificadaAlta (8.8)—

Un vaciado insuficiente del TLB para huéspedes x86 PV en modo de sombra Para la migración, así como para trabajar en torno a los kernels que no son conscientes de L1TF (véase XSA-273), los huéspedes PV pueden ejecutarse en modo de paginación de sombra. Para abordar XSA-401, el código fue movido dentro de una función en Xen. Este movimiento de código pasó por alto una variable que cambiaba de significado/valor entre las posiciones de código antiguas y nuevas. El uso ahora erróneo de la variable conllevaba a una condición errónea de vaciado de la TLB, omitiendo el vaciado cuando era necesario.

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).

Tecnologías afectadas (3)

Debian — Debian LinuxFedoraproject — FedoraXEN — XEN

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-33745",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "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
      }
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  },
  "affected": [
    {
      "source": "security@xen.org",
      "affectedData": [
        {
          "vendor": "Xen",
          "product": "xen",
          "versions": [
            {
              "status": "unknown",
              "version": "consult Xen advisory XSA-408"
            }
          ]
        }
      ]
    }
  ],
  "published": "2022-07-26T13:15:10.003",
  "references": [
    {
      "url": "http://www.openwall.com/lists/oss-security/2022/07/26/2",
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      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "security@xen.org"
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HUFIMNGYP5VQAA6KE3T2I5GW6UP6F7BS/",
      "source": "security@xen.org"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
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      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was moved inside a function in Xen. This code movement missed a variable changing meaning / value between old and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition, omitting flushes where such are necessary."
    },
    {
      "lang": "es",
      "value": "Un vaciado insuficiente del TLB para huéspedes x86 PV en modo de sombra Para la migración, así como para trabajar en torno a los kernels que no son conscientes de L1TF (véase XSA-273), los huéspedes PV pueden ejecutarse en modo de paginación de sombra. Para abordar XSA-401, el código fue movido dentro de una función en Xen. Este movimiento de código pasó por alto una variable que cambiaba de significado/valor entre las posiciones de código antiguas y nuevas. El uso ahora erróneo de la variable conllevaba a una condición errónea de vaciado de la TLB, omitiendo el vaciado cuando era necesario."
    }
  ],
  "lastModified": "2026-06-17T04:49:21.813",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*",
              "vulnerable": true,
              "matchCriteriaId": "EF4E17C2-244F-4E5A-A5F8-4626CD1AC11A"
            }
          ],
          "operator": "OR"
        }
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      "nodes": [
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            },
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  "sourceIdentifier": "security@xen.org"
}