drm/nouveau/uvmm: fix NULL deref unwinding an OP_MAP_SPARSE op

{
  "id": "22f81c8f6ce0dce3d693ad7d3fe35e7de1ea7c444e3ca37e4d505f721c57b942",
  "url": "https://osv.dev/vulnerability/CVE-2026-89802",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/nouveau/uvmm: fix NULL deref unwinding an OP_MAP_SPARSE op",
    "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.",
    "evidence": "osv:CVE-2026-89802",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.51",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89802",
      "aliases": [
        "CVE-2026-89802"
      ],
      "affected": [
        {
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              "type": "GIT",
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                  "fixed": "d8ec34618e71018fd7a3f73c57c6b92d71a6c7c3"
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                {
                  "fixed": "3bf493cf7ed0c2b3df728977a257e0d99b4db1c6"
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                {
                  "fixed": "b7dc03e09313d22a6d230b759de3b05d504c008f"
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                {
                  "fixed": "3857238de6bce6c1573e8cb86c37b067e5208f05"
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                  "fixed": "412a6ceb56d501ef2f8202e26ab4b5d4dfbca566"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89802.json"
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        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "6.6.0"
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                  "fixed": "6.18.51"
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "6.19.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89802.json"
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      ],
      "modified": "2026-10-28T02:30:30.801151499Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3857238de6bce6c1573e8cb86c37b067e5208f05",
        "https://git.kernel.org/stable/c/3bf493cf7ed0c2b3df728977a257e0d99b4db1c6",
        "https://git.kernel.org/stable/c/412a6ceb56d501ef2f8202e26ab4b5d4dfbca566",
        "https://git.kernel.org/stable/c/b7dc03e09313d22a6d230b759de3b05d504c008f",
        "https://git.kernel.org/stable/c/d8ec34618e71018fd7a3f73c57c6b92d71a6c7c3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89802.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89802",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89802.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89802",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497821,
  "published_at": "2026-09-16T10:30:35.738+00:00"
}