drm/xe: Fix oops in xe_gem_fault when running core_hotunplug test.

{
  "id": "3e51304d9a4cc196b79f81c464d1b893489db8c933f6162fb0fb6e01b36ff8da",
  "url": "https://osv.dev/vulnerability/CVE-2025-40340",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/xe: Fix oops in xe_gem_fault when running core_hotunplug test.",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/xe: Fix oops in xe_gem_fault when running core_hotunplug test. I saw an oops in xe_gem_fault when running the xe-fast-feedback testlist against the realtime kernel without debug options enabled. The panic happens after core_hotunplug unbind-rebind finishes. Presumably what happens is that a process mmaps, unlocks because of the FAULT_FLAG_RETRY_NOWAIT logic, has no process memory left, causing ttm_bo_vm_dummy_page() to return VM_FAULT_NOPAGE, since there was nothing left to populate, and then oopses in \"mem_type_is_vram(tbo->resource->mem_type)\" because tbo->resource is NULL. It's convoluted, but fits the data and explains the oops after the test exits.",
    "evidence": "osv:CVE-2025-40340",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.12.58",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.17.8",
            "evidence": "/affected/1/ranges"
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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              "type": "ECOSYSTEM",
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                  "introduced": "6.8.0"
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      ],
      "modified": "2026-10-28T02:30:49.315165654Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1cda3c755bb7770be07d75949bb0f45fb88651f6",
        "https://git.kernel.org/stable/c/29a3064f9c5a908aaf0b39cd6ed30374db11840d",
        "https://git.kernel.org/stable/c/99428bd6123d5676209dfb1d7a8f176cc830b665",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40340.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40340",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 517231,
  "published_at": "2025-12-09T04:09:57.059+00:00"
}