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CVE-2026-89801

Estado: RecibidaAlta (7.8)—

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

drm/nouveau/uvmm: fix premature region free on failed OP_UNMAP_SPARSE

In nouveau_uvmm_bind_job_submit()'s OP_UNMAP_SPARSE arm, op->reg is set from nouveau_uvma_region_find(), which only looks the region up and takes no reference; a region's sole reference is its membership in uvmm->region_mt. Two failure paths leave op->reg set: the -ENOENT check when the region is busy, and the drm_gpuvm_sm_unmap_ops_create() failure. The sibling nouveau_uvmm_sm_unmap_prepare() failure just below clears op->reg; these two do not.

unwind_continue steps back one op, so the failing op is skipped by the unwind loop and its op->reg stays set. nouveau_uvmm_bind_job_cleanup() then enters its if (op->reg) branch and calls nouveau_uvma_region_remove() and nouveau_uvma_region_put() on it, dropping the tree's sole reference and freeing a region this job never created.

Leer descripción completaMostrar menos

The comment above the cleanup loop documents the broken invariant: op->reg must be NULL on submit failure.

This frees a live region on an unrelated failure, reachable single-job when drm_gpuvm_sm_unmap_ops_create() returns -ENOMEM; if another job owns the same region, its cleanup then removes and puts the freed region, a use-after-free. Clear op->reg on both failure paths.

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 que permite escalada de privilegios mediante manejo de memoria defectuoso (use-after-free) en el subsistema DRM/nouveau, causando DoS o corrupción de datos del sistema.

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 StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

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-2026-89801",
  "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": "b88baab828713ce0b49b185444b2ee83bed373a8",
              "lessThan": "ba42d8a1c2c7629c61914df11a7d63ac77449ffb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b88baab828713ce0b49b185444b2ee83bed373a8",
              "lessThan": "88114e3a96582882e63b2f73aa7a5a9cf0d5073c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b88baab828713ce0b49b185444b2ee83bed373a8",
              "lessThan": "24c25b182d17d1bdfde0088c96bdf6f93e8f46bc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b88baab828713ce0b49b185444b2ee83bed373a8",
              "lessThan": "4083d24c2636fde7b18076115af52820d203bc57",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b88baab828713ce0b49b185444b2ee83bed373a8",
              "lessThan": "ccf930812f23b8259ef64fd3394d53b093e4651a",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_uvmm.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.6",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "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-rc2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_uvmm.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-16T11:16:44.997",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/24c25b182d17d1bdfde0088c96bdf6f93e8f46bc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4083d24c2636fde7b18076115af52820d203bc57",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/88114e3a96582882e63b2f73aa7a5a9cf0d5073c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ba42d8a1c2c7629c61914df11a7d63ac77449ffb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ccf930812f23b8259ef64fd3394d53b093e4651a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/uvmm: fix premature region free on failed OP_UNMAP_SPARSE\n\nIn nouveau_uvmm_bind_job_submit()'s OP_UNMAP_SPARSE arm, op->reg is set\nfrom nouveau_uvma_region_find(), which only looks the region up and takes\nno reference; a region's sole reference is its membership in\nuvmm->region_mt. Two failure paths leave op->reg set: the -ENOENT check\nwhen the region is busy, and the drm_gpuvm_sm_unmap_ops_create() failure.\nThe sibling nouveau_uvmm_sm_unmap_prepare() failure just below clears\nop->reg; these two do not.\n\nunwind_continue steps back one op, so the failing op is skipped by the\nunwind loop and its op->reg stays set. nouveau_uvmm_bind_job_cleanup()\nthen enters its if (op->reg) branch and calls nouveau_uvma_region_remove()\nand nouveau_uvma_region_put() on it, dropping the tree's sole reference\nand freeing a region this job never created. The comment above the\ncleanup loop documents the broken invariant: op->reg must be NULL on\nsubmit failure.\n\nThis frees a live region on an unrelated failure, reachable single-job\nwhen drm_gpuvm_sm_unmap_ops_create() returns -ENOMEM; if another job owns\nthe same region, its cleanup then removes and puts the freed region, a\nuse-after-free. Clear op->reg on both failure paths."
    }
  ],
  "lastModified": "2026-09-16T15:18:09.867",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}