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CVE-2026-97496

Estado: RecibidaAlta (7.1)—

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

drm/amdkfd: Fix OOB memory exposure in get_wave_state()

The get_wave_state() function for v9 trusts cp_hqd_cntl_stack_size and cp_hqd_cntl_stack_offset values read directly from the MQD, which are written by GPU microcode and fully attacker-controlled on the CRIU-restore path (via AMDKFD_IOC_RESTORE_PROCESS with H3).

this leads to an unbounded copy_to_user() that can leak adjacent GTT/kernel memory. If offset > size, integer underflow produces a ~4 GiB read length, if size is set to 1 MiB against a 4 KiB allocation, we leak 1 MiB of adjacent kernel memory (other queues' MQDs, ring buffers, KASLR pointers).

Leer descripción completaMostrar menos

Fix by clamping both cp_hqd_cntl_stack_size to the actual allocated buffer size (q->ctl_stack_size) and cp_hqd_cntl_stack_offset to the clamped size before performing arithmetic and copy_to_user().

This ensures we never read beyond the allocated kernel BO regardless of attacker-supplied MQD field values.

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.

Escalada de privilegios local (PR:L) explotando lectura OOB en kernel. Leak de memoria del kernel (KASLR, MQDs, ring buffers) via copy_to_user() sin validación de tamaño.

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

User Account ManagementThreat Intelligence ProgramExecution PreventionBehavior Prevention on EndpointApplication Isolation and SandboxingExploit Protection

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-2026-97496",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "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": "42c6c48214b726c30918e8dc80e2168607d13ae4",
              "lessThan": "e2bef0f168be46692a6b900916ff5da3771480ed",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "42c6c48214b726c30918e8dc80e2168607d13ae4",
              "lessThan": "d9183d974ddd5f09d029beaf359275ac20d4d5fe",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "42c6c48214b726c30918e8dc80e2168607d13ae4",
              "lessThan": "ec646686613d8ab05b282d1463a7baa49fd6b83b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "42c6c48214b726c30918e8dc80e2168607d13ae4",
              "lessThan": "7ef144458f48d5589e36f1b3d83e83db2e5c5ba5",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_v9.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-24T17:17:27.290",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/7ef144458f48d5589e36f1b3d83e83db2e5c5ba5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d9183d974ddd5f09d029beaf359275ac20d4d5fe",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e2bef0f168be46692a6b900916ff5da3771480ed",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ec646686613d8ab05b282d1463a7baa49fd6b83b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix OOB memory exposure in get_wave_state()\n\nThe get_wave_state() function for v9 trusts cp_hqd_cntl_stack_size and\ncp_hqd_cntl_stack_offset values read directly from the MQD, which are\nwritten by GPU microcode and fully attacker-controlled on the\nCRIU-restore path (via AMDKFD_IOC_RESTORE_PROCESS with H3).\n\nthis leads to an unbounded copy_to_user() that can leak adjacent\nGTT/kernel memory. If offset > size, integer underflow produces a ~4 GiB\nread length, if size is set to 1 MiB against a 4 KiB allocation, we leak\n1 MiB of adjacent kernel memory (other queues' MQDs, ring buffers, KASLR\npointers).\n\nFix by clamping both cp_hqd_cntl_stack_size to the actual allocated\nbuffer size (q->ctl_stack_size) and cp_hqd_cntl_stack_offset to the\nclamped size before performing arithmetic and copy_to_user().\n\nThis ensures we never read beyond the allocated kernel BO regardless of\nattacker-supplied MQD field values."
    }
  ],
  "lastModified": "2026-10-03T11:17:59.480",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}