{"schema":"threatline.record/2","record":{"id":"CVE-2026-98309","aliases":[],"summary":"drm/vc4: Use managed KMS polling to fix UAF on unbind","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98309","source_modified_at":"2026-10-19T09:17:19.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","lessThan":"b6beee927e7f4e3142032ff91b2d0417cdddc0f6","status":"affected","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","lessThan":"cf0c4432bda37b02e7d430ff5017228ceb7caf0c","status":"affected","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","lessThan":"ee507691c18f9fee5d4751e295ab9a7ff31d59ae","status":"affected","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","lessThan":"7f9780df677370a19b4ec9764f13b1b82073e0d9","status":"affected","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","lessThan":"073a30d75f309812ed61af134f24ffef4107b13a","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98309","source_modified_at":"2026-10-19T09:17:19.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.4","status":"affected"},{"version":"0","lessThan":"4.4","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98309","source_modified_at":"2026-10-19T09:17:19.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7f9780df677370a19b4ec9764f13b1b82073e0d9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98309","source_modified_at":"2026-10-19T09:17:19.914Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"073a30d75f309812ed61af134f24ffef4107b13a","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00175,"percentile":0.06671,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:46:05.957Z","modified_at":"2026-10-19T09:17:19.914Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98309","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:17:19.914Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98309","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/cf0c4432bda37b02e7d430ff5017228ceb7caf0c"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ee507691c18f9fee5d4751e295ab9a7ff31d59ae"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7f9780df677370a19b4ec9764f13b1b82073e0d9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/073a30d75f309812ed61af134f24ffef4107b13a"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:17:19.914Z","content_hash":"1f652b286b8712aa7208c6f6c5d80b6193b459b8fd198f93463195cee229922d"}}