CVE-2026-98409: watchdog: rtd119x: Avoid division by zero

CVE-2026-98409: watchdog: rtd119x: Avoid division by zero

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

watchdog: rtd119x: Avoid division by zero

clk_get_rate() could return 0.  Avoid a division by zero panic.

The Linux kernel CVE team has assigned CVE-2026-98409 to this issue.


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

	Issue introduced in 4.16 with commit 2bdf6acbfead7e9aa69f36ee5682d1e5c8f70367 and fixed in 6.6.158 with commit 757c721545b9ffac5c3042a0cd3685ea28af7e81
	Issue introduced in 4.16 with commit 2bdf6acbfead7e9aa69f36ee5682d1e5c8f70367 and fixed in 6.12.112 with commit 1f22001b34984350844d629862f70934770cb796
	Issue introduced in 4.16 with commit 2bdf6acbfead7e9aa69f36ee5682d1e5c8f70367 and fixed in 6.18.54 with commit b4ede87765a2e58ca4f18f5f8037c4826b9cc93f
	Issue introduced in 4.16 with commit 2bdf6acbfead7e9aa69f36ee5682d1e5c8f70367 and fixed in 7.2.8 with commit 8a12e049d517d7dee78500633f8f0e47262a67e0
	Issue introduced in 4.16 with commit 2bdf6acbfead7e9aa69f36ee5682d1e5c8f70367 and fixed in 7.3-rc4 with commit 5af7d2cbd20f893def03c8310a460ade66a5d822

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-2026-98409
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/watchdog/rtd119x_wdt.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/757c721545b9ffac5c3042a0cd3685ea28af7e81
	https://git.kernel.org/stable/c/1f22001b34984350844d629862f70934770cb796
	https://git.kernel.org/stable/c/b4ede87765a2e58ca4f18f5f8037c4826b9cc93f
	https://git.kernel.org/stable/c/8a12e049d517d7dee78500633f8f0e47262a67e0
	https://git.kernel.org/stable/c/5af7d2cbd20f893def03c8310a460ade66a5d822