linux-cve-announce - CVE-2026-23129: dpll: Prevent duplicate registrations

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Message-ID: <2026021410-CVE-2026-23129-81ae@gregkh>
Date: Sat, 14 Feb 2026 16:10:21 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23129: dpll: Prevent duplicate registrations

From: Greg Kroah-Hartman <gregkh@...nel.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.

The Linux kernel CVE team has assigned CVE-2026-23129 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 6.7 with commit 9431063ad323ac864750aeba4d304389bc42ca4e and fixed in 6.12.68 with commit dfec0501dba8f4711ef142a6a890e4812b7af88c
	Issue introduced in 6.7 with commit 9431063ad323ac864750aeba4d304389bc42ca4e and fixed in 6.18.8 with commit 236a657422a564859dcd0db7bdb486abb21a721a
	Issue introduced in 6.7 with commit 9431063ad323ac864750aeba4d304389bc42ca4e and fixed in 6.19 with commit f3ddbaaaaf4d0633b40482f471753f9c71294a4a

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-23129
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	drivers/dpll/dpll_core.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/dfec0501dba8f4711ef142a6a890e4812b7af88c
	https://git.kernel.org/stable/c/236a657422a564859dcd0db7bdb486abb21a721a
	https://git.kernel.org/stable/c/f3ddbaaaaf4d0633b40482f471753f9c71294a4a