CVE-2026-89872

What the bug is

In v4l2_fwnode_parse_link(), the remote endpoint fwnode reference is acquired using fwnode_graph_get_remote_endpoint(). This reference is properly released in the error paths, but it is leaked on the success path. Add the missing fwnode_handle_put() before returning 0 to prevent the reference leak. [Sakari Ailus: Fix subject prefix and coding style a little.]

Where it lives

The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.

drivers/media/v4l2-core/v4l2-fwnode.c

What this is

V4L2 ASYNC AND FWNODE FRAMEWORKSMAINTAINERS section matched on drivers/media/v4l2-core/v4l2-fwnode.c · linux-media@vger.kernel.org · Maintained

Kernel module

v4l2_fwnode

Check it on the machine

grep -wE 'CONFIG_V4L2_FWNODE|CONFIG_VIDEO_DEV' /boot/config-$(uname -r)

Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.

lsmod | grep -w v4l2_fwnode

Prints a line if that module is loaded right now, and nothing if it is not. One that is not loaded can still be loaded later by anything that needs it.

Show whether Debian builds this, per release

Debian builds this, but not on every flavour. At least one release below builds the code on some of its kernel flavours and not on others, so the answer depends on the architecture and flavour installed.

• bookworm, trixie, forky, sid, bookworm · linux-6.12Mnot built on amd64/cloud-amd64, arm64/cloud-arm64

M

a module where it is built at all; some flavours do not build it

Build switches

CONFIG_V4L2_FWNODE, CONFIG_VIDEO_DEV

Reads as

all on means the file is compiled; any one off means it is not.

From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages

Signals

Published

2026-09-16 (33 days ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.21%, higher than 10.5% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/media

Upstream fixes

The versions the CNA records as introducing and fixing this, and the commit for each. source

Introduced	Fixed in	Commit
4.13	5.10.270	c9b5238d173e
4.13	5.15.221	ccd8d1d80afa
4.13	6.1.188	d92dc4692834
4.13	6.6.157	ef609b3ce456
4.13	6.12.110	578c4bfa28bf
4.13	6.18.51	3ced388b7908
4.13	7.2.5	881aafb13952
4.13	7.3	a6e86efd7f85

Debian advisories