CVE-2026-74654

In the Linux kernel, the following vulnerability has been resolved:

serial: 8250_dma: Clear stale RX state on shutdown

serial8250_release_dma() terminates RX DMA and releases the channel, but

leaves rx_running set. If the port is closed while an RX transfer is

active, the stale state remains while rxchan is NULL until the channel is

requested again on the next open.

The DesignWare BUSY workaround added by commit a7b9ce39fbe4

("serial: 8250_dw: Ensure BUSY is deasserted") calls

serial8250_rx_dma_flush() from the LCR write path during startup. This

happens before serial8250_request_dma() obtains a new RX channel. On

reopen, the stale rx_running state therefore makes the flush path pass a

NULL channel to dmaengine_pause(), causing a kernel Oops.

Clear rx_running after terminating RX DMA, matching the TX cleanup. Also

make the flush helper return if the DMA object or RX channel is not

available so startup and teardown paths cannot pass a NULL channel to the

DMAengine API.