CVE-2026-93283

What the bug is

When device_register() fails in i3c_master_register_new_i3c_devs(), put_device() is called to drop the reference taken by device_register(). That drops the last reference, so the device's release callback i3c_device_release() runs and frees the i3c_device. Two problems follow from that: i3c_device_release() does WARN_ON(i3cdev->desc), so it warns because desc->dev->desc still points back at the descriptor. Clear it before calling put_device(). After put_device() frees the i3c_device, desc->dev is left pointing at freed memory, so clear desc->dev as well. That prevents, for example, i3c_master_unregister_i3c_devs() seeing desc->dev as non-NULL and dereferencing it.

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/i3c/master.c

What this is

I3C SUBSYSTEMMAINTAINERS section matched on drivers/i3c/ · linux-i3c@lists.infradead.org · Maintained

Kernel module

none to look for. The file would have gone into i3c, and Debian does not compile it into that module, so finding i3c in lsmod would say nothing about this CVE.

Check it on the machine

grep -w CONFIG_I3C /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.

Show whether Debian builds this, per release

Debian does not build this code. In 5 releases below, every kernel flavour Debian publishes has the switch off, so the vulnerable file is compiled into no kernel binary Debian ships.

• bookworm, trixie, forky, sid, bookworm · linux-6.12n

n

not enabled on any flavour - this release does not build the code

Build switch

CONFIG_I3C

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

2026-09-24 (24 days ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.20%, higher than 8.7% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/i3c

Upstream fixes

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

Introduced	Fixed in	Commit
5.10.201	5.10.270	5bf498623f83
5.15.139	5.15.221	20a2b6df91fd
6.1.63	6.1.188	a14dbdf47100
6.6.2	6.6.157	d22ad96f1a0c
6.7	6.12.110	7f8e2c4f3704
6.7	6.18.52	7ef12e1dd06e
6.7	7.2.6	6ecf17bf5fe8
6.7	7.3	74be657d98a8
5.4.261	0	0
6.5.12	0	0

Debian advisories