CVE-2026-89802 (GCVE-0-2026-89802)
Vulnerability from cvelistv5
Published
2026-09-16 10:30
Modified
2026-10-21 12:48
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/nouveau/uvmm: fix NULL deref unwinding an OP_MAP_SPARSE op Each bind_job_op is zeroed by kzalloc_obj() in bind_job_op_from_uop(), and the OP_MAP_SPARSE case in nouveau_uvmm_bind_job_submit() only creates a region, so op->ops stays NULL for a successfully processed sparse map. If a later op in the same job fails, the reverse unwind loop revisits that op and calls drm_gpuva_ops_free(&uvmm->base, op->ops) unconditionally. drm_gpuva_ops_free() dereferences its argument right away (list_for_each_entry_safe on &ops->list), so a NULL op->ops oopses. The path is reachable by any render-node fd holder, since NOUVEAU_VM_BIND is DRM_RENDER_ALLOW. Guard the free with IS_ERR_OR_NULL(), as nouveau_uvmm_bind_job_cleanup() already does for the identical free.
References
Impacted products
Vendor Product Version
Linux Linux Version: b88baab828713ce0b49b185444b2ee83bed373a8
Version: b88baab828713ce0b49b185444b2ee83bed373a8
Version: b88baab828713ce0b49b185444b2ee83bed373a8
Version: b88baab828713ce0b49b185444b2ee83bed373a8
Version: b88baab828713ce0b49b185444b2ee83bed373a8
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_uvmm.c"
          ],
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          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_uvmm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.6"
            },
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              "version": "0",
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              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
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              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.12.110",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/uvmm: fix NULL deref unwinding an OP_MAP_SPARSE op\n\nEach bind_job_op is zeroed by kzalloc_obj() in bind_job_op_from_uop(),\nand the OP_MAP_SPARSE case in nouveau_uvmm_bind_job_submit() only creates\na region, so op-\u003eops stays NULL for a successfully processed sparse map.\n\nIf a later op in the same job fails, the reverse unwind loop revisits that\nop and calls drm_gpuva_ops_free(\u0026uvmm-\u003ebase, op-\u003eops) unconditionally.\ndrm_gpuva_ops_free() dereferences its argument right away\n(list_for_each_entry_safe on \u0026ops-\u003elist), so a NULL op-\u003eops oopses. The\npath is reachable by any render-node fd holder, since NOUVEAU_VM_BIND is\nDRM_RENDER_ALLOW.\n\nGuard the free with IS_ERR_OR_NULL(), as nouveau_uvmm_bind_job_cleanup()\nalready does for the identical free."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:48:45.811Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d8ec34618e71018fd7a3f73c57c6b92d71a6c7c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bf493cf7ed0c2b3df728977a257e0d99b4db1c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7dc03e09313d22a6d230b759de3b05d504c008f"
        },
        {
          "url": "https://git.kernel.org/stable/c/3857238de6bce6c1573e8cb86c37b067e5208f05"
        },
        {
          "url": "https://git.kernel.org/stable/c/412a6ceb56d501ef2f8202e26ab4b5d4dfbca566"
        }
      ],
      "title": "drm/nouveau/uvmm: fix NULL deref unwinding an OP_MAP_SPARSE op",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89802",
    "datePublished": "2026-09-16T10:30:35.738Z",
    "dateReserved": "2026-09-11T19:38:34.767Z",
    "dateUpdated": "2026-10-21T12:48:45.811Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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