Bug 2507056 (CVE-2026-64497)

Summary: CVE-2026-64497 kernel: iio: chemical: scd30: Cleanup initializations and fix sign-extension bug
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's iio: chemical: scd30 driver, which manages a specific type of sensor. This vulnerability involves an error in how the driver processes numerical data, specifically a 'sign-extension bug' that can corrupt a part of a floating-point number called the exponent. This corruption could lead to the sensor providing inaccurate readings or cause the system to behave unexpectedly.
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Description OSIDB Bzimport 2026-07-25 10:02:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

iio: chemical: scd30: Cleanup initializations and fix sign-extension bug

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.
Comment 1 Mauro Matteo Cascella 2026-07-29 18:34:12 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072551-CVE-2026-64497-00c3@gregkh/T