CVE-2026-63930 iio: buffer: hw-consumer: fix use-after-free in error path
A use-after-free vulnerability in the Linux kernel's IIO buffer subsystem allows attackers to potentially execute code or escalate privileges via a crafted 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-2026-63930?
CVE-2026-63930 is a high-severity use after free vulnerability in Linux, published on 19 Jul 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: buffer: hw-consumer: fix use-after-free in error path
In the err_put_buffers cleanup path of iio_hw_consumer_alloc(), the code was using list_for_each_entry() to iterate through buffers while calling iio_buffer_put() which can free the current buffer if refcount drops to 0. The list_for_each_entry() loop macro then evaluates buf->head.next to continue iteration, accessing the freed buffer.
Fix this by using list_for_each_entry_safe().
Which versions are affected by CVE-2026-63930?
How do I fix CVE-2026-63930?
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-2026-63930 being exploited?
There is no known exploitation of CVE-2026-63930 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-63930, DEBIAN-CVE-2026-63930, GHSA-ggvg-29pg-f22f, ROOT-OS-UBUNTU-2204-CVE-2026-63930, UBUNTU-CVE-2026-63930.