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CVE-2026-80702

Estado: RecibidaAlta (7.8)—

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

drm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size

Two sites in vmwgfx_resource.c assign boolean literals to res->guest_memory_size, which is an unsigned long allocation-size field; the intended target is the adjacent res->guest_memory_dirty bitfield. After the assignments the field holds 0 or 1 instead of the resource's MOB allocation size:

Subsequent revalidation paths read guest_memory_size when computing the dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer allocation size (vmw_resource_buf_alloc()), producing zero-length walks or wrap-around ranges that read or write past the MOB bitmap.

Leer descripción completaMostrar menos

The dirty-tracking intent of the original code (mark the resource as dirtied since the last sync) is also lost, since guest_memory_dirty is never updated.

Rename both assignments to guest_memory_dirty.

Detalles técnicos trazas, registros y código del informe original
  - vmw_resource_release()       writes 0 (false), and
  - vmw_resource_unbind_list()   writes 1 (true).

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 (AV:L/PR:L) en kernel Linux. Sobrescritura de campos de memoria en driver gráfico permite leer/escribir más allá del bitmap asignado (T1005, T1565) o causar DoS (T1499.004).

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 ProgramRestrict File and Directory PermissionsRemote Data StorageNetwork SegmentationFilter Network TrafficExecution Prevention

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-2026-80702",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "lessThan": "21bbe38faee4a195d33a93e3908e307807f7745d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "lessThan": "9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "lessThan": "282f261cb035e5f01a486f76d356b7e9dbfba73f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "lessThan": "3b2bb16a5b622867140d69925db411ac8ecb3b2b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "668b206601c5f5063e03b76784a0d3024fa2b249",
              "lessThan": "83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_resource.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.4",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/vmwgfx/vmwgfx_resource.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-28T08:16:55.740",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size\n\nTwo sites in vmwgfx_resource.c assign boolean literals to\nres->guest_memory_size, which is an unsigned long allocation-size\nfield; the intended target is the adjacent res->guest_memory_dirty\nbitfield.  After the assignments the field holds 0 or 1 instead of\nthe resource's MOB allocation size:\n\n  - vmw_resource_release()       writes 0 (false), and\n  - vmw_resource_unbind_list()   writes 1 (true).\n\nSubsequent revalidation paths read guest_memory_size when computing\nthe dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer\nallocation size (vmw_resource_buf_alloc()), producing zero-length\nwalks or wrap-around ranges that read or write past the MOB bitmap.\nThe dirty-tracking intent of the original code (mark the resource as\ndirtied since the last sync) is also lost, since guest_memory_dirty\nis never updated.\n\nRename both assignments to guest_memory_dirty."
    }
  ],
  "lastModified": "2026-08-29T07:16:51.943",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}