Bug 2507222 (CVE-2026-64303)

Summary: CVE-2026-64303 kernel: spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `fsl-lpspi` driver. This vulnerability occurs when the transmit (TX) Direct Memory Access (DMA) channel fails to prepare, but the receive (RX) DMA channel continues to operate. This can lead to memory corruption or a use-after-free condition, potentially allowing an attacker to compromise system integrity or execute unauthorized code.
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Description OSIDB Bzimport 2026-07-25 10:11:28 UTC 
In the Linux kernel, the following vulnerability has been resolved:

spi: fsl-lpspi: terminate the RX channel on TX prepare failure path

When dmaengine_prep_slave_sg() fails for the TX channel, the error path
terminates the TX DMA channel but leaves the RX channel running. Since
the RX channel was already submitted and issued prior to preparing
the TX descriptor, returning -EINVAL causes the SPI core to unmap the
DMA buffers while the RX DMA engine continues writing to them, leading
to potential memory corruption or use-after-free.

Terminate the RX channel before returning on the TX prepare failure path.
Comment 1 TEJ RATHI 2026-07-29 09:24:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072507-CVE-2026-64303-7a2d@gregkh/T