{"id":"CVE-2026-98309","state":"PUBLISHED","title":"drm/vc4: Use managed KMS polling to fix UAF on unbind","description":"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.","publishedAt":"2026-10-06T08:46:05.957Z","updatedAt":"2026-10-19T09:17:19.914Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","status":"affected","lessThan":"b6beee927e7f4e3142032ff91b2d0417cdddc0f6","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","status":"affected","lessThan":"cf0c4432bda37b02e7d430ff5017228ceb7caf0c","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","status":"affected","lessThan":"ee507691c18f9fee5d4751e295ab9a7ff31d59ae","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","status":"affected","lessThan":"7f9780df677370a19b4ec9764f13b1b82073e0d9","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","status":"affected","lessThan":"073a30d75f309812ed61af134f24ffef4107b13a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/vc4/vc4_kms.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.4","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/vc4/vc4_kms.c"]}],"references":["https://git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6","https://git.kernel.org/stable/c/cf0c4432bda37b02e7d430ff5017228ceb7caf0c","https://git.kernel.org/stable/c/ee507691c18f9fee5d4751e295ab9a7ff31d59ae","https://git.kernel.org/stable/c/7f9780df677370a19b4ec9764f13b1b82073e0d9","https://git.kernel.org/stable/c/073a30d75f309812ed61af134f24ffef4107b13a"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98309.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98309","state":"PUBLISHED","datePublished":"2026-10-06T08:46:05.957Z","dateUpdated":"2026-10-19T09:17:19.914Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.338Z"},"containers":{"cna":{"title":"drm/vc4: Use managed KMS polling to fix UAF on unbind","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","status":"affected","lessThan":"b6beee927e7f4e3142032ff91b2d0417cdddc0f6","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","status":"affected","lessThan":"cf0c4432bda37b02e7d430ff5017228ceb7caf0c","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","status":"affected","lessThan":"ee507691c18f9fee5d4751e295ab9a7ff31d59ae","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","status":"affected","lessThan":"7f9780df677370a19b4ec9764f13b1b82073e0d9","versionType":"git"},{"version":"c8b75bca92cbf064b9fa125fc74a85994452e935","status":"affected","lessThan":"073a30d75f309812ed61af134f24ffef4107b13a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/vc4/vc4_kms.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.4","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/vc4/vc4_kms.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6"},{"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:17:19.914Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}