CVE-2026-23129 dpll: Prevent duplicate registrations
Duplicate DPLL pin registrations cause kernel warnings and potential instability, requiring a patch to enforce strict registration policies.
- 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-2026-23129?
CVE-2026-23129 is a medium-severity vulnerability in Linux kernel, published on 14 Feb 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:
dpll: Prevent duplicate registrations
Modify the internal registration helpers dpll_xa_ref_{dpll,pin}_add() to reject duplicate registration attempts.
Previously, if a caller attempted to register the same pin multiple times (with the same ops, priv, and cookie) on the same device, the core silently increments the reference count and return success. This behavior is incorrect because if the caller makes these duplicate registrations then for the first one dpll_pin_registration is allocated and for others the associated dpll_pin_ref.refcount is incremented. During the first unregistration the associated dpll_pin_registration is freed and for others WARN is fired.
Fix this by updating the logic to return `-EEXIST` if a matching registration is found to enforce a strict "register once" policy.
Which versions are affected by CVE-2026-23129?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23129?
Apply the vendor's patch.
Is CVE-2026-23129 being exploited?
There is no known exploitation of CVE-2026-23129 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-23129, DEBIAN-CVE-2026-23129, GHSA-rp48-fq7w-35g6, ROOT-OS-UBUNTU-2404-CVE-2026-23129, UBUNTU-CVE-2026-23129.