Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
c8b75bca92cbf064b9fa125fc74a85994452e935 to < b6beee927e7f4e3142032ff91b2d0417cdddc0f6affectedc8b75bca92cbf064b9fa125fc74a85994452e935 to < cf0c4432bda37b02e7d430ff5017228ceb7caf0caffectedc8b75bca92cbf064b9fa125fc74a85994452e935 to < ee507691c18f9fee5d4751e295ab9a7ff31d59aeaffectedc8b75bca92cbf064b9fa125fc74a85994452e935 to < 7f9780df677370a19b4ec9764f13b1b82073e0d9affectedc8b75bca92cbf064b9fa125fc74a85994452e935 to < 073a30d75f309812ed61af134f24ffef4107b13aaffected
Linux Linux
Default version status: affected
4.4affected0 to < 4.4unaffected6.6.158 to ≤ 6.6.*unaffected6.12.112 to ≤ 6.12.*unaffected6.18.54 to ≤ 6.18.*unaffected7.2.8 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
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 ↗