CVE-2026-98309 (GCVE-0-2026-98309)
Vulnerability from cvelistv5
Published
2026-10-06 08:46
Modified
2026-10-19 09:17
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Use managed KMS polling to fix UAF on unbind vc4_kms_load() calls drm_kms_helper_poll_init() but the driver provides no matching drm_kms_helper_poll_fini(). The output poll work stays scheduled after unbind and runs on the freed drm_device: # modprobe vc4; rmmod vc4; sleep 10 BUG: KASAN: slab-use-after-free in delayed_work_timer_fn BUG: KASAN: slab-use-after-free in drm_client_dev_hotplug [drm] Workqueue: events output_poll_execute [drm_kms_helper] Allocated by task 171: __devm_drm_dev_alloc Freed by task 262 (rmmod): drm_dev_put / component_del Use drmm_kms_helper_poll_init() so polling is finalized with the device, as other drivers do.
References
Impacted products
Vendor Product Version
Linux Linux Version: c8b75bca92cbf064b9fa125fc74a85994452e935
Version: c8b75bca92cbf064b9fa125fc74a85994452e935
Version: c8b75bca92cbf064b9fa125fc74a85994452e935
Version: c8b75bca92cbf064b9fa125fc74a85994452e935
Version: c8b75bca92cbf064b9fa125fc74a85994452e935
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vc4/vc4_kms.c"
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          "vendor": "Linux",
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "nodes": [
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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/vc4: Use managed KMS polling to fix UAF on unbind\n\nvc4_kms_load() calls drm_kms_helper_poll_init() but the driver provides\nno matching drm_kms_helper_poll_fini(). The output poll work stays\nscheduled after unbind and runs on the freed drm_device:\n\n  # modprobe vc4; rmmod vc4; sleep 10\n  BUG: KASAN: slab-use-after-free in delayed_work_timer_fn\n  BUG: KASAN: slab-use-after-free in drm_client_dev_hotplug [drm]\n  Workqueue: events output_poll_execute [drm_kms_helper]\n  Allocated by task 171: __devm_drm_dev_alloc\n  Freed by task 262 (rmmod): drm_dev_put / component_del\n\nUse drmm_kms_helper_poll_init() so polling is finalized with the device,\nas other drivers do."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:17:19.914Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6"
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        {
          "url": "https://git.kernel.org/stable/c/cf0c4432bda37b02e7d430ff5017228ceb7caf0c"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee507691c18f9fee5d4751e295ab9a7ff31d59ae"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f9780df677370a19b4ec9764f13b1b82073e0d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/073a30d75f309812ed61af134f24ffef4107b13a"
        }
      ],
      "title": "drm/vc4: Use managed KMS polling to fix UAF on unbind",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98309",
    "datePublished": "2026-10-06T08:46:05.957Z",
    "dateReserved": "2026-09-25T10:25:14.338Z",
    "dateUpdated": "2026-10-19T09:17:19.914Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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