CVE-2026-43061
Description
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.
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Affected products
1Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/2a72403b985aea6b4aac3171830492f9a387f9e1nvdPatch
- git.kernel.org/stable/c/5f6b17562f03fc65c7d3474ef8f1959b19d1ca41nvdPatch
- git.kernel.org/stable/c/79a19bd936bb35f56ef0ccab1b3b59ebce8c762dnvdPatch
- git.kernel.org/stable/c/8190f9ab6ad90cb97652adbebd238b874a4ef70dnvdPatch
- git.kernel.org/stable/c/a424a34b8faddf97b5af41689087e7a230f79ba7nvdPatch
- git.kernel.org/stable/c/b5ad887339503103d0fbe9827b16ad287597c275nvdPatch
- git.kernel.org/stable/c/d2719a0a9c3439abf67843a5504b7afccd9ded93nvdPatch
- git.kernel.org/stable/c/f76d91271bcacbd759a2e4ee3ea61faa6a727ccfnvdPatch
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