CVE-2026-98667 iio: frequency: adf4377: Fully initialize clk_init_data and clk_parent_data
Uninitialized kernel structure members in the ADF4377 driver can cause a system crash, requiring specific kernel configurations to trigger.
- 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-2026-98667?
CVE-2026-98667 is a 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: frequency: adf4377: Fully initialize clk_init_data and clk_parent_data
The clk_init_data structure contains several mutually-exclusive members for different methods to specify the possible parents of a clock, prompting drivers to initialize only the members they need. However, not initializing all members may cause subtle issues, which are only exposed when CONFIG_INIT_STACK_ALL_PATTERN or CONFIG_INIT_STACK_NONE is enabled.
adf4377_clk_register() fills in init.parent_data, and assumes that init.parent_names is NULL. However, the latter is uninitialized, and thus may cause a crash.
Similarly, adf4377_clk_register() fills in only parent_data.fw_name, leaving other members of the clk_parent_data structure uninitialized.
Make sure all members are fully initialized, to fix such bugs, and to avoid future breakage when converting drivers to a different method for specifying the parents.
Which versions are affected by CVE-2026-98667?
How do I fix CVE-2026-98667?
Apply the vendor's patch.
Is CVE-2026-98667 being exploited?
There is no known exploitation of CVE-2026-98667 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-98667, GHSA-xcxr-v5jx-qv69, UBUNTU-CVE-2026-98667.