CVE-2026-89892

/// Technical description

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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References