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CVE-2025-38511

Estado: ModificadaMedia (5.5)—

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

drm/xe/pf: Clear all LMTT pages on alloc

Our LMEM buffer objects are not cleared by default on alloc and during VF provisioning we only setup LMTT PTEs for the actually provisioned LMEM range. But beyond that valid range we might leave some stale data that could either point to some other VFs allocations or even to the PF pages.

Explicitly clear all new LMTT page to avoid the risk that a malicious VF would try to exploit that gap.

While around add asserts to catch any undesired PTE overwrites and low-level debug traces to track LMTT PT life-cycle.

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(cherry picked from commit 3fae6918a3e27cce20ded2551f863fb05d4bef8d)

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 (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-38511",
  "cveTags": [],
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    "cvssMetricV31": [
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        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "version": "3.1",
          "baseScore": 8.8,
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          "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",
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        "exploitabilityScore": 2
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          "product": "Linux",
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              "versionType": "git"
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          "programFiles": [
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              "versionType": "semver",
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              "version": "6.15.7",
              "versionType": "semver",
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              "version": "6.16",
              "versionType": "original_commit_for_fix",
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          "programFiles": [
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  "published": "2025-08-16T11:15:44.140",
  "references": [
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      "url": "https://git.kernel.org/stable/c/5d21892c2e15b6a27f8bc907693eca7c6b7cc269",
      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/705a412a367f383430fa34bada387af2e52eb043",
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe/pf: Clear all LMTT pages on alloc\n\nOur LMEM buffer objects are not cleared by default on alloc\nand during VF provisioning we only setup LMTT PTEs for the\nactually provisioned LMEM range. But beyond that valid range\nwe might leave some stale data that could either point to some\nother VFs allocations or even to the PF pages.\n\nExplicitly clear all new LMTT page to avoid the risk that a\nmalicious VF would try to exploit that gap.\n\nWhile around add asserts to catch any undesired PTE overwrites\nand low-level debug traces to track LMTT PT life-cycle.\n\n(cherry picked from commit 3fae6918a3e27cce20ded2551f863fb05d4bef8d)"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/xe/pf: Borrar todas las páginas LMTT al asignar. Nuestros objetos de búfer LMEM no se borran por defecto al asignar, y durante el aprovisionamiento de VF solo configuramos PTE LMTT para el rango LMEM realmente aprovisionado. Sin embargo, más allá de ese rango válido, podríamos dejar datos obsoletos que podrían apuntar a otras asignaciones de VF o incluso a las páginas PF. Borre explícitamente todas las páginas LMTT nuevas para evitar el riesgo de que una VF maliciosa intente explotar esa brecha. Mientras esté disponible, agregue aserciones para detectar cualquier sobrescritura de PTE no deseada y trazas de depuración de bajo nivel para rastrear el ciclo de vida de las PT LMTT. (Seleccionado de el commit 3fae6918a3e27cce20ded2551f863fb05d4bef8d)"
    }
  ],
  "lastModified": "2026-07-30T06:23:23.297",
  "configurations": [
    {
      "nodes": [
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}