CVE-2026-93101 media: v4l2-async: Unregister sub-device if asc_list is empty
A null pointer dereference in the Linux kernel media subsystem causes a system crash when specific USB video devices are disconnected.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-93101?
CVE-2026-93101 is a vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In the Linux kernel, the following vulnerability has been resolved:
media: v4l2-async: Unregister sub-device if asc_list is empty
When my em28xx USB device that uses the i2c tvp5150 driver is disconnected, it crashes.
The cause is that the tvp5150 i2c module uses v4l2_async, but the em28xx driver does not since it predates v4l2_async.
In that corner case sd->asc_list is empty, so v4l2_async_unregister_subdev() never calls v4l2_device_unregister_subdev().
Modify the code so that, if sd->asc_list is empty, v4l2_device_unregister_subdev() is still called.
Which versions are affected by CVE-2026-93101?
How do I fix CVE-2026-93101?
Apply the vendor's patch.
Is CVE-2026-93101 being exploited?
There is no known exploitation of CVE-2026-93101 in the wild and no public exploit code.
Sources
Also known as AZL-102942, BELL-CVE-2026-93101, DEBIAN-CVE-2026-93101, GHSA-3xmx-x378-q7fc, UBUNTU-CVE-2026-93101.