CVE-2026-64303
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk48th percentile - higher than 48% of all known CVEs
Summary
In the Linux kernel's fsl-lpspi SPI driver, a bug was fixed where the RX channel was not terminated when DMA preparation for the TX channel failed. This could lead to memory corruption or a use-after-free bug, as DMA continued writing to buffers that had already been unmapped.
Risk Assessment
This could allow an attacker to exploit a use-after-free bug to corrupt kernel memory or execute arbitrary code, compromising system security.
Recommendation
It is recommended to update the Linux kernel to a version containing the fix for CVE-2026-64303.
Original NVD description (English source)
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.