System crash via absent message dereference
Published Apr 24, 2026 · Updated Apr 24, 2026
NULL pointer dereference in the SPI DesignWare DMA driver in Linux Kernel allows local users to crash the system during a DMA timeout. The dw_spi_dma_wait function logs a timeout through ctlr->cur_msg->spi even when the controller has no current message, dereferencing an absent object. Exploitation requires local low-privilege access, an affected kernel with the DesignWare SPI DMA path in use, and a transaction timeout; the reported consequence is system unavailability.
Summary
What happened
NULL pointer dereference in the SPI DesignWare DMA driver in Linux Kernel allows local users to crash the system during a DMA timeout. The dw_spi_dma_wait function logs a timeout through ctlr->cur_msg->spi even when the controller has no current message, dereferencing an absent object. Exploitation requires local low-privilege access, an affected kernel with the DesignWare SPI DMA path in use, and a transaction timeout; the reported consequence is system unavailability.
The record
- CVE
- CVE-2026-31560
- Published
- Apr 24, 2026
- Updated
- Apr 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 24, 2026CVE publishedPublication date reported by the CVE source.
- Apr 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <184f5aaf72f1f1c73e66bae0b8d28e81c2f2a72f
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3b46d61890632c8f8b117147b6923bff4b42ccb7
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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