Look up another CVE · open CVE-2026-53344 in the interactive tracker

CVE-2026-53344

pinctrl: mcp23s08: Initialize mcp->dev and mcp->addr before regmap init

EPSS 0.1%

Published 2026-07-01 (4 months ago) by the Linux kernel CNA. Subsystem drivers/pinctrl. Debian urgency: unimportant.

What to do, per Debian release

Debian's own status for CVE-2026-53344 in every release this site tracks, and what each one means in practice. Every status below is the one the Debian Security Team publishes for this CVE. source

Release	Status	Version	What this means
Debian 12bookworm	not affected	6.1.190-1	Nothing to do. bookworm never shipped the vulnerable code.
Debian 13trixie	not affected	6.12.113-1	Nothing to do. trixie never shipped the vulnerable code.
Debian 14forky	fixed	7.0.13-1	Update the kernel and reboot. Fixed in 7.0.13-1. A running kernel keeps the old code until the machine restarts.
Debian unstablesid	fixed	7.0.13-1	Update the kernel and reboot. Fixed in 7.0.13-1. A running kernel keeps the old code until the machine restarts.

The vulnerability

What the bug is

Regmap initialization triggers regcache_maple_populate() which attempts SPI read to populate cache. SPI read requires mcp->dev and mcp->addr to be set, without them, NULL pointer dereference occurs during probe. Move initialization before mcp23s08_spi_regmap_init() call.

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/pinctrl/pinctrl-mcp23s08_spi.c

What this is: PIN CONTROL SUBSYSTEMMAINTAINERS section matched on drivers/pinctrl/ · linux-gpio@vger.kernel.org · Maintained
Kernel module: pinctrl_mcp23s08_spi

Check it on the machine

grep -wE 'CONFIG_PINCTRL|CONFIG_PINCTRL_MCP23S08_SPI' /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 pinctrl_mcp23s08_spi

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.

bookwormMnot built on amd64/amd64, amd64/cloud-amd64, amd64/rt/amd64, arm64/arm64, arm64/cloud-arm64, arm64/rt/arm64, i386/686, i386/686-pae, i386/rt/686-pae, ppc64el/powerpc64le
trixieMnot built on amd64/amd64, amd64/cloud-amd64, amd64/rt/amd64, arm64/arm64, arm64/arm64-16k, arm64/cloud-arm64, arm64/rt/arm64, armel/rpi, ppc64el/powerpc64le, ppc64el/powerpc64le-64k, riscv64/riscv64, s390x/s390x
forky, sidMnot built on amd64/amd64, amd64/cloud-amd64, amd64/rt-amd64, arm64/arm64, arm64/arm64-16k, arm64/cloud-arm64, arm64/rt-arm64, loong64/loong64, ppc64el/powerpc64le, ppc64el/powerpc64le-64k, riscv64/riscv64, s390x/s390x

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

Build switches: CONFIG_PINCTRL, CONFIG_PINCTRL_MCP23S08_SPI
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

Debian tracker CVE record NVD kernel CNA record

Signals

Published: 2026-07-01 (4 months ago)source
CVSS: no vector published, unrated
Attack vector: not published
EPSS: 0.12%, higher than 1.5% of all CVEssource
CISA KEV: not listedthe KEV catalogue
Debian urgency: unimportantsource
Subsystem: drivers/pinctrl

Upstream fixes

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

Introduced	Fixed in	Commit
6.19	7.0.13	3a13bb9540df
6.19	7.1	8473c3a197b5

Why the CNA scored it this way

The kernel CNA published no CVSS vector and no reasoning for CVE-2026-53344, which is why it is shown as unrated rather than given an invented score. 6,405 of the 20,413 CVEs here carry reasoning; this is not one of them.