CVE-2026-23129
Unknown Unknown - Not Provided
Duplicate Registration Vulnerability in Linux Kernel DPLL Component

Publication date: 2026-02-14

Last updated on: 2026-03-18

Assigner: kernel.org

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.
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Meta Information
Published
2026-02-14
Last Modified
2026-03-18
Generated
2026-06-16
AI Q&A
2026-02-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23129
EUVD
EUVD-2026-5909
Affected Vendors & Products
Showing 8 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 6.7 (inc) to 6.12.68 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.8 (exc)
linux linux_kernel 6.19
Helpful Resources
Exploitability
CWE
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's dpll component, where duplicate registrations of the same pin on the same device were allowed. Previously, if a caller tried to register the same pin multiple times with identical parameters, the system would silently increment a reference count and return success, even though this behavior was incorrect.

The problem was that the first registration allocated a dpll_pin_registration, but subsequent duplicate registrations only incremented a reference count. When the first unregistration occurred, the allocated registration was freed, causing warnings for the remaining references.

The fix enforces a strict "register once" policy by modifying the registration helpers to reject duplicate registration attempts and return an error code (-EEXIST) if a matching registration is found.

Impact Analysis

This vulnerability can lead to incorrect reference counting in the Linux kernel's dpll pin registration system. As a result, it may cause warnings or errors during unregistration, potentially leading to instability or unexpected behavior in the kernel's device management.

While the description does not specify direct security impacts such as privilege escalation or denial of service, the improper handling of duplicate registrations could affect system reliability or debugging processes.

Compliance Impact

I don't know

Detection Guidance

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Mitigation Strategies

The vulnerability is fixed by modifying the internal registration helpers to reject duplicate registration attempts, returning an error if a duplicate is found. To mitigate this vulnerability, you should update your Linux kernel to a version that includes this fix.

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