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.

https://git.kernel.org/stable/c/9f2444f4c0e4b06f61bae38da87c9c94c78efa86

https://git.kernel.org/stable/c/ae05d9e50b6b9f246c110b3bdc03676145c2d0d4

https://git.kernel.org/stable/c/bf4fb620e02962b2b52500a4b3d8420f351eb46a

https://git.kernel.org/stable/c/d06cfb1add4a2d5b393e9e31f49ebbd168beea49

https://git.kernel.org/stable/c/e10f06ee050a08930e2339b6fec7148fd0b2a8f6

https://git.kernel.org/stable/c/e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41

https://git.kernel.org/stable/c/e7a5d792cf64a2096e18f1d573cc3d01cba15e92

https://git.kernel.org/stable/c/e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9

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