FKIE_CVE-2025-40340

Vulnerability from fkie_nvd - Published: 2025-12-09 16:17 - Updated: 2026-10-14 22:10
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1cda3c755bb7770be07d75949bb0f45fb88651f6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/29a3064f9c5a908aaf0b39cd6ed30374db11840d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/99428bd6123d5676209dfb1d7a8f176cc830b665
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/xe/xe_bo.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "99428bd6123d5676209dfb1d7a8f176cc830b665",
              "status": "affected",
              "version": "dd08ebf6c3525a7ea2186e636df064ea47281987",
              "versionType": "git"
            },
            {
              "lessThan": "29a3064f9c5a908aaf0b39cd6ed30374db11840d",
              "status": "affected",
              "version": "dd08ebf6c3525a7ea2186e636df064ea47281987",
              "versionType": "git"
            },
            {
              "lessThan": "1cda3c755bb7770be07d75949bb0f45fb88651f6",
              "status": "affected",
              "version": "dd08ebf6c3525a7ea2186e636df064ea47281987",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/xe/xe_bo.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: Fix oops in xe_gem_fault when running core_hotunplug test.\n\nI saw an oops in xe_gem_fault when running the xe-fast-feedback\ntestlist against the realtime kernel without debug options enabled.\n\nThe panic happens after core_hotunplug unbind-rebind finishes.\nPresumably what happens is that a process mmaps, unlocks because\nof the FAULT_FLAG_RETRY_NOWAIT logic, has no process memory left,\ncausing ttm_bo_vm_dummy_page() to return VM_FAULT_NOPAGE, since\nthere was nothing left to populate, and then oopses in\n\"mem_type_is_vram(tbo-\u003eresource-\u003emem_type)\" because tbo-\u003eresource\nis NULL.\n\nIt\u0027s convoluted, but fits the data and explains the oops after\nthe test exits."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/xe: Correcci\u00f3n de un oops en xe_gem_fault al ejecutar la prueba core_hotunplug.\n\nVi un oops en xe_gem_fault al ejecutar la lista de pruebas xe-fast-feedback contra el kernel en tiempo real sin las opciones de depuraci\u00f3n habilitadas.\n\nEl p\u00e1nico ocurre despu\u00e9s de que finaliza el desvinculado-rev\u00ednculo de core_hotunplug. Presumiblemente lo que sucede es que un proceso mapea memoria (mmaps), desbloquea debido a la l\u00f3gica FAULT_FLAG_RETRY_NOWAIT, no le queda memoria de proceso, haciendo que ttm_bo_vm_dummy_page() devuelva VM_FAULT_NOPAGE, ya que no quedaba nada por poblar, y luego ocurre un oops en \u0027mem_type_is_vram(tbo -\u003e resource -\u003e mem_type)\u0027 porque tbo -\u003e resource es NULL.\n\nEs enrevesado, pero encaja con los datos y explica el oops despu\u00e9s de que la prueba finaliza."
    }
  ],
  "id": "CVE-2025-40340",
  "lastModified": "2026-10-14T22:10:00.210",
  "metrics": {},
  "published": "2025-12-09T16:17:44.267",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1cda3c755bb7770be07d75949bb0f45fb88651f6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/29a3064f9c5a908aaf0b39cd6ed30374db11840d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/99428bd6123d5676209dfb1d7a8f176cc830b665"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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