CVE-2026-43061

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> serial: 8250: Fix TX deadlock when using DMA<br /> <br /> `dmaengine_terminate_async` does not guarantee that the<br /> `__dma_tx_complete` callback will run. The callback is currently the<br /> only place where `dma-&gt;tx_running` gets cleared. If the transaction is<br /> canceled and the callback never runs, then `dma-&gt;tx_running` will never<br /> get cleared and we will never schedule new TX DMA transactions again.<br /> <br /> This change makes it so we clear `dma-&gt;tx_running` after we terminate<br /> the DMA transaction. This is "safe" because `serial8250_tx_dma_flush`<br /> is holding the UART port lock. The first thing the callback does is also<br /> grab the UART port lock, so access to `dma-&gt;tx_running` is serialized.