CVE-2024-42249: spi: don't unoptimize message in spi_async()

Severity: low (CVSS 3.3 v3.1)
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: 2024-08-07 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: spi: don't unoptimize message in spi_async() Calling spi_maybe_unoptimize_message() in spi_async() is wrong because the message is likely to be in the queue and not transferred yet. This can corrupt the message while it is being used by the controller driver. spi_maybe_unoptimize_message() is already called in the correct place in spi_finalize_current_message() to balance the call to spi_maybe_optimize_message() in spi_async().

Affected products

Linux kernel: from 6.9 before 6.9.10 — fixed in 6.9.10

How to fix

Upgrade to a fixed version: Linux kernel 6.9.10. Check the vendor advisory for mitigations.

References

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