spi: microchip-core-qspi: don't attempt to transmit during emulated read-only dual/quad operations

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Summary

CVECVE-2026-46192
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:34 UTC
Updated2026-05-28 13:44:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: spi: microchip-core-qspi: don't attempt to transmit during emulated read-only dual/quad operations The core will deal with reads by creating clock cycles itself, there's no need to generate clock cycles by transmitting garbage data at the driver level. Further, transmitting garbage data just bricks the transfer since QSPI doesn't have a dedicated master-out line like MOSI in regular SPI. I'm not entirely sure if the transfer is bricked because of the garbage data being transmitted on the bus or because the core loses track of whether it is supposed to be sending or receiving data.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.043220000 (date 2026-05-28)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8f9cf02c8852837923f1cdacfcc92e138513325c ec9d0ddbde6003c303fa5e1d5cd48952852984d8 git Not specified
CNA Linux Linux affected 8f9cf02c8852837923f1cdacfcc92e138513325c 67184f361ab4d9fac6d2b8d5fed6649d496038a4 git Not specified
CNA Linux Linux affected 8f9cf02c8852837923f1cdacfcc92e138513325c eb56deaabf127e8985fc91fa6c97bf8a3b062844 git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.18.30 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/67184f361ab4d9fac6d2b8d5fed6649d496038a4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ec9d0ddbde6003c303fa5e1d5cd48952852984d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb56deaabf127e8985fc91fa6c97bf8a3b062844 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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