CVE-2026-64497

What the bug is

Include linux/bitfield.h for FIELD_GET(). Create new macros for bit manipulation in combination with manual bit manipulation being replaced with FIELD_GET(). The current variable declaration and initializations are barely readable and use comma separations across multiple lines. Refactor the initializations so that mantissa and exp have separate declarations and sign gets initialized later. In addition (and due to the nature of the cleanup), fix a sign-extension bug where, float32 would get bitwise anded with ~BIT(31) (which is 0xFFFFFFFF7FFFFFFF) which corrupted the exponent.

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/iio/chemical/scd30_core.c

What this is

SENSIRION SCD30 CARBON DIOXIDE SENSOR DRIVERMAINTAINERS section matched on drivers/iio/chemical/scd30_core.c · Maintained

Kernel module

none to look for. The file would have gone into scd30_core, and Debian does not compile it into that module, so finding scd30_core in lsmod would say nothing about this CVE.

Check it on the machine

grep -wE 'CONFIG_IIO|CONFIG_SCD30_CORE' /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 switches

CONFIG_IIO, CONFIG_SCD30_CORE

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

2026-07-25 (3 months ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.18%, higher than 6.8% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/iio

Upstream fixes

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

Introduced	Fixed in	Commit
5.9	5.10.261	0ccff849bde9
5.9	5.15.212	1821bcacd8ac
5.9	6.1.178	40bb0fdb37f4
5.9	6.6.145	b131f0011dfe
5.9	6.12.96	8d4a46e971cf
5.9	6.18.39	82accdd57404
5.9	7.1.4	d49ff54b2784
5.9	7.2	60d877910a43

Debian advisories