CVE-2026-89522 media: staging/ipu7: fix async notifier UAF on probe error path
A use-after-free vulnerability in the Linux kernel IPU7 driver allows attackers to cause memory corruption and potential code execution via a probe error path.
- 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-2026-89522?
CVE-2026-89522 is a high-severity use after free vulnerability in Linux, published on 11 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: staging/ipu7: fix async notifier UAF on probe error path
isys_register_devices() registers the V4L2 async notifier via isys_notifier_init(). If a subsequent probe step such as isys_fw_log_init() fails, isys_probe() jumps to the out_cleanup label which only calls isys_unregister_devices(). That helper tears down the video devices, subdevices, V4L2 device and media device, but never unregisters or cleans up the async notifier.
As a result the notifier stays chained in the global notifier_list while the enclosing struct ipu7_isys is freed by devres, leading to list corruption and a use-after-free the next time the list is walked.
The remove path already does the right thing by calling isys_notifier_cleanup() before isys_unregister_devices(). Mirror that on the probe error path so the notifier is unregistered and cleaned up before the device is torn down.
Which versions are affected by CVE-2026-89522?
How do I fix CVE-2026-89522?
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-2026-89522 being exploited?
There is no known exploitation of CVE-2026-89522 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-89522, DEBIAN-CVE-2026-89522, GHSA-p4hr-jw27-vj7c, UBUNTU-CVE-2026-89522.