drm/xe/oa: Fix exec_queue leak on width check in stream open

{
  "id": "939a1fddf9d029fbc9343d56c266798a05bad1f69f5ab31e76d1f203c0b4ec5d",
  "url": "https://osv.dev/vulnerability/CVE-2026-64021",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/xe/oa: Fix exec_queue leak on width check in stream open",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/xe/oa: Fix exec_queue leak on width check in stream open In xe_oa_stream_open_ioctl(), when param.exec_q->width > 1 the function returns -EOPNOTSUPP directly, skipping the existing err_exec_q cleanup path. The exec_queue reference obtained by xe_exec_queue_lookup() is leaked. The exec queue holds a reference on the xe_file, which is only dropped during queue teardown. The leaked lookup ref is not on the file's exec_queue xarray, so file close cannot release it. This keeps both the exec queue and the file private state pinned indefinitely. Jump to err_exec_q instead of returning directly so the reference is released. (cherry picked from commit 339fa0be9e4a5d69fa47e91f4a36574224fb478f)",
    "evidence": "osv:CVE-2026-64021",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.34",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-64021",
      "aliases": [
        "CVE-2026-64021"
      ],
      "affected": [
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              "type": "GIT",
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                {
                  "fixed": "04ef7592eaadd9ca8f8f66e76452f73525cff819"
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                {
                  "fixed": "4b0c4f0c1b133d4bfa31c167200bcda646873328"
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                  "fixed": "4d25342543c01310fc4e0cba7cb17c775e2421e2"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64021.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
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                {
                  "fixed": "6.18.34"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64021.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.638052300Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/04ef7592eaadd9ca8f8f66e76452f73525cff819",
        "https://git.kernel.org/stable/c/4b0c4f0c1b133d4bfa31c167200bcda646873328",
        "https://git.kernel.org/stable/c/4d25342543c01310fc4e0cba7cb17c775e2421e2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64021.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64021",
        "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/2026/64xxx/CVE-2026-64021.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64021",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 517716,
  "published_at": "2026-07-19T15:39:14.741+00:00"
}