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CVE-2026-64497: iio: chemical: scd30: Cleanup initializations and fix sign-extension bug

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-08-17

Description

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.

Affected products

• Linux kernel: 5.9 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0ccff849bde90973e6c13a666f6ceab5c55b30d4
• https://git.kernel.org/stable/c/1821bcacd8ac5b214c53be16cbb8172bf193f0b6
• https://git.kernel.org/stable/c/40bb0fdb37f441c9c9f52bf58bbd8a0ca3cc9598
• https://git.kernel.org/stable/c/60d877910a43c305b5165131b258a17b1d772d57
• https://git.kernel.org/stable/c/82accdd57404399eddf3d56fd9beda7c61307388
• https://git.kernel.org/stable/c/8d4a46e971cf846bda98b20d4cabfa21c1276e5f
• https://git.kernel.org/stable/c/b131f0011dfef72350f4e3f11df94dc3e6b46065
• https://git.kernel.org/stable/c/d49ff54b2784aa56a7c97982de713604de89d23a

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