{"id":"CVE-2026-98309","title":"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()","summary":"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(). T…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= c8b75bca92cbf064b9fa125fc74a85994452e935 < b6beee927e7f4e3142032ff91b2d0417cdddc0f6","Linux >= c8b75bca92cbf064b9fa125fc74a85994452e935 < cf0c4432bda37b02e7d430ff5017228ceb7caf0c","Linux >= c8b75bca92cbf064b9fa125fc74a85994452e935 < ee507691c18f9fee5d4751e295ab9a7ff31d59ae","Linux >= c8b75bca92cbf064b9fa125fc74a85994452e935 < 7f9780df677370a19b4ec9764f13b1b82073e0d9","Linux >= c8b75bca92cbf064b9fa125fc74a85994452e935 < 073a30d75f309812ed61af134f24ffef4107b13a","Linux 4.4"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T09:18:22.300","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98309","references":[{"url":"https://git.kernel.org/stable/c/073a30d75f309812ed61af134f24ffef4107b13a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7f9780df677370a19b4ec9764f13b1b82073e0d9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cf0c4432bda37b02e7d430ff5017228ceb7caf0c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ee507691c18f9fee5d4751e295ab9a7ff31d59ae","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-06T08:50:17.413Z","slug":"CVE-2026-98309","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}