CVE-2026-89890 media: go7007: defer the ALSA v4l2 put until card release
A use-after-free vulnerability in the Linux kernel go7007 driver allows local attackers to execute arbitrary code or escalate privileges via race conditions during device removal.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89890?
CVE-2026-89890 is a high-severity use after free vulnerability in Linux, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
media: go7007: defer the ALSA v4l2 put until card release
go7007_snd_init() already takes a v4l2_device reference for the ALSA side, but go7007_snd_remove() drops it immediately after calling snd_card_free_when_closed().
That is too early when a userspace process still has the capture PCM open. The ALSA card and its PCM callbacks remain alive until the last file is closed, so the release path can still reach struct go7007 through pcm->private_data and call go7007_snd_hw_free() after the V4L2 release path has freed the object.
Move the matching v4l2_device_put() to the ALSA card private_free callback so the existing ALSA reference covers the whole deferred card lifetime.
Which versions are affected by CVE-2026-89890?
How do I fix CVE-2026-89890?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-89890 being exploited?
There is no known exploitation of CVE-2026-89890 in the wild and no public exploit code.
Sources
Also known as AZL-101684, BELL-CVE-2026-89890, DEBIAN-CVE-2026-89890, GHSA-qhgv-8fw2-7hch, UBUNTU-CVE-2026-89890.