CVE-2026-63883

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A race condition exists in the qcom geni serial driver when uart flush buffer() is executed before the DMA completion interrupt request (IRQ) is delivered. If kfifo reset() is called while a DMA transfer is completing, the tx remaining variable may remain positive while the kfifo is emptied. When the DMA IRQ subsequently triggers handle tx dma(), the call to uart xmit advance() can cause the kfifo output pointer to wrap around the input pointer. This results in an incorrect kfifo length calculation, leading the next start tx dma() call to transmit stale buffer data. This issue is caused by a kfifo underflow.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.