CVE-2026-98670 iio: adc: xilinx-xadc: free IRQ before cancelling the unmask worker on unbind
A race condition in the Xilinx XADC driver allows a use-after-free during device unbind, potentially leading to system crashes or code execution.
- 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-2026-98670?
CVE-2026-98670 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: adc: xilinx-xadc: free IRQ before cancelling the unmask worker on unbind
The ZYNQ XADC alarm IRQ handler queues zynq_unmask_work via schedule_delayed_work(); that work is cleared by a devm callback. Register the devm callback before devm_request_irq() so the devres LIFO teardown frees the IRQ first, ensuring the handler can no longer queue work by the time the workqueue is cleared. Otherwise the handler could re-arm the work and run it after the xadc structure has been freed.
This issue was found by an in-house static analysis tool.
Which versions are affected by CVE-2026-98670?
How do I fix CVE-2026-98670?
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-2026-98670 being exploited?
There is no known exploitation of CVE-2026-98670 in the wild and no public exploit code.
Sources
Also known as AZL-109361, BELL-CVE-2026-98670, DEBIAN-CVE-2026-98670, GHSA-pfxr-v75f-fxq3, UBUNTU-CVE-2026-98670.