CVE-2026-43061

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

• linux linux kernel (>= 5.4.291 < 5.5) • linux linux kernel (>= 5.10.235 < 5.10.253) • linux linux kernel (>= 5.15.179 < 5.15.203) • linux linux kernel (>= 6.1.129 < 6.1.167) • linux linux kernel (>= 6.6.79 < 6.6.130) • linux linux kernel (>= 6.12.16 < 6.12.78) • linux linux kernel (>= 6.13.4 < 6.14) • linux linux kernel (>= 6.14.1 < 6.18.20) • linux linux kernel (>= 6.19 < 6.19.10) • linux linux kernel 6.14 • linux linux kernel 7.0