CVE-2026-93123
UnknownSummary
In the Linux kernel, the qcom-geni serial DMA TX completion path advanced the transmit FIFO by the byte count stored in port->tx_remaining. If uart_flush_buffer() ran after the hardware completed a DMA transfer but before the completion interrupt was handled, a stale DMA completion could advance and discard new bytes written after the flush. The fix marks an in-flight DMA transfer as stale when the transmit FIFO is flushed.
Risk Assessment
On systems using this driver, data sent over the serial port may be lost or corrupted due to a race between buffer flushing and the DMA completion interrupt. This can lead to failed transmissions or application data loss.
Recommendation
Update the Linux kernel to a version containing the qcom-geni driver fix. If updating is not possible, avoid concurrent buffer flushing and heavy writes on the serial port.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: serial: qcom-geni: do not advance stale DMA completions The qcom GENI serial DMA TX completion path advances the transmit fifo by the number of bytes recorded in port->tx_remaining. If uart_flush_buffer() runs after the hardware has completed a DMA transfer but before the DMA completion interrupt has been handled, the serial core resets the transmit fifo while port->tx_remaining still describes the old DMA transfer. A previous fix avoided advancing an empty fifo by checking that the fifo length is at least tx_remaining. That still does not distinguish the old DMA payload from new bytes written after the flush. If userspace writes new data before the stale DMA completion interrupt is handled, the fifo can again contain at least tx_remaining bytes and the stale completion can advance and discard those new bytes. Mark an in-flight DMA transfer stale when the transmit fifo is flushed. The later completion still unprepares the original DMA mapping using the saved length, but it no longer advances the transmit fifo.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS