CVE-2026-89892

In the Linux kernel, the following vulnerability has been resolved:

media: em28xx: defer audio-only extension registration

The audio-only path registers extensions while probing the primary device.
For a dual-TS board, this happens before dev_next is created. The duplicate
device inherits is_audio_only and is then independently inserted into
em28xx_devlist.

The list is intended to contain only primary devices: extension operations
reach the secondary device through dev_next. The independently linked
secondary can be freed during disconnect while its list node remains
reachable, resulting in a use-after-free.

Defer audio-only extension registration to the module-request work item. It
runs only after probing has completed construction of the optional
secondary device, so only the primary is registered and extension callbacks
reach the secondary through dev_next.