FKIE_CVE-2026-98309

Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-06 09:18
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/073a30d75f309812ed61af134f24ffef4107b13a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7f9780df677370a19b4ec9764f13b1b82073e0d9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf0c4432bda37b02e7d430ff5017228ceb7caf0c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ee507691c18f9fee5d4751e295ab9a7ff31d59ae
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vc4/vc4_kms.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b6beee927e7f4e3142032ff91b2d0417cdddc0f6",
              "status": "affected",
              "version": "c8b75bca92cbf064b9fa125fc74a85994452e935",
              "versionType": "git"
            },
            {
              "lessThan": "cf0c4432bda37b02e7d430ff5017228ceb7caf0c",
              "status": "affected",
              "version": "c8b75bca92cbf064b9fa125fc74a85994452e935",
              "versionType": "git"
            },
            {
              "lessThan": "ee507691c18f9fee5d4751e295ab9a7ff31d59ae",
              "status": "affected",
              "version": "c8b75bca92cbf064b9fa125fc74a85994452e935",
              "versionType": "git"
            },
            {
              "lessThan": "7f9780df677370a19b4ec9764f13b1b82073e0d9",
              "status": "affected",
              "version": "c8b75bca92cbf064b9fa125fc74a85994452e935",
              "versionType": "git"
            },
            {
              "lessThan": "073a30d75f309812ed61af134f24ffef4107b13a",
              "status": "affected",
              "version": "c8b75bca92cbf064b9fa125fc74a85994452e935",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vc4/vc4_kms.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.4"
            },
            {
              "lessThan": "4.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "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/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."
    }
  ],
  "id": "CVE-2026-98309",
  "lastModified": "2026-10-06T09:18:22.300",
  "metrics": {},
  "published": "2026-10-06T09:18:22.300",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/073a30d75f309812ed61af134f24ffef4107b13a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7f9780df677370a19b4ec9764f13b1b82073e0d9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf0c4432bda37b02e7d430ff5017228ceb7caf0c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ee507691c18f9fee5d4751e295ab9a7ff31d59ae"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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