CVE-2026-98656 iio: trigger: cancel reenable_work before freeing trigger
A use-after-free vulnerability in the Linux kernel IIO trigger subsystem allows attackers to cause denial of service or execute code via race conditions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98656?
CVE-2026-98656 is an use after free vulnerability in Linux, published on 18 Oct 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:
iio: trigger: cancel reenable_work before freeing trigger
iio_trigger_notify_done_atomic() defers ->reenable() into trig->reenable_work on the system workqueue, and the worker dereferences the owning trigger through container_of(). Nothing cancels this work before iio_trig_release() frees the trigger, so a worker armed by the last in-flight IRQ can outlive the free and touch freed memory.
Cancel it at the top of iio_trig_release(), which every free path reaches through the device core's final put_device().
Found by an in-house static analysis tool.
Which versions are affected by CVE-2026-98656?
How do I fix CVE-2026-98656?
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-2026-98656 being exploited?
There is no known exploitation of CVE-2026-98656 in the wild and no public exploit code.
Sources
Also known as AZL-108942, BELL-CVE-2026-98656, DEBIAN-CVE-2026-98656, GHSA-6556-hh6q-qw3c, UBUNTU-CVE-2026-98656.