{"api_version":"1","generated_at":"2026-10-07T00:03:00+00:00","cve":"CVE-2026-98309","urls":{"html":"https://cve.report/CVE-2026-98309","api":"https://cve.report/api/cve/CVE-2026-98309.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98309","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98309"},"summary":{"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-06 09:18:22","updated_at":"2026-10-06 09:18:22"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/ee507691c18f9fee5d4751e295ab9a7ff31d59ae","name":"https://git.kernel.org/stable/c/ee507691c18f9fee5d4751e295ab9a7ff31d59ae","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7f9780df677370a19b4ec9764f13b1b82073e0d9","name":"https://git.kernel.org/stable/c/7f9780df677370a19b4ec9764f13b1b82073e0d9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/073a30d75f309812ed61af134f24ffef4107b13a","name":"https://git.kernel.org/stable/c/073a30d75f309812ed61af134f24ffef4107b13a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cf0c4432bda37b02e7d430ff5017228ceb7caf0c","name":"https://git.kernel.org/stable/c/cf0c4432bda37b02e7d430ff5017228ceb7caf0c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6","name":"https://git.kernel.org/stable/c/b6beee927e7f4e3142032ff91b2d0417cdddc0f6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98309","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98309","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c8b75bca92cbf064b9fa125fc74a85994452e935 b6beee927e7f4e3142032ff91b2d0417cdddc0f6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c8b75bca92cbf064b9fa125fc74a85994452e935 cf0c4432bda37b02e7d430ff5017228ceb7caf0c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c8b75bca92cbf064b9fa125fc74a85994452e935 ee507691c18f9fee5d4751e295ab9a7ff31d59ae git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c8b75bca92cbf064b9fa125fc74a85994452e935 7f9780df677370a19b4ec9764f13b1b82073e0d9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c8b75bca92cbf064b9fa125fc74a85994452e935 073a30d75f309812ed61af134f24ffef4107b13a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.4","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.4 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.54 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.8 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc4 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.54","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.8","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc4","versionStartIncluding":"4.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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":"2026-10-06T08:46:05.957Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"drm/vc4: Use managed KMS polling to fix UAF on unbind","x_generator":{"engine":"bippy-1.2.0"}}},"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":"2026-10-06T08:46:05.957Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-06 09:18:22","lastModifiedDate":"2026-10-06 09:18:22","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98309","Ordinal":"1","Title":"drm/vc4: Use managed KMS polling to fix UAF on unbind","CVE":"CVE-2026-98309","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98309","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"drm/vc4: Use managed KMS polling to fix UAF on unbind"}]}}}