CVE-2021-47064 Information

Description

In the Linux kernel the following vulnerability has been resolved:

mt76: fix potential DMA mapping leak

With buf uninitialized in mt76_dma_tx_queue_skb_raw its field skip_unmap could potentially inherit a non-zero value from stack garbage. If this happens it will cause DMA mappings for MCU command frames to not be unmapped after completion

Reference

https://git.kernel.org/stable/c/9fa26701cd1fc4d932d431971efc5746325bdfce https://git.kernel.org/stable/c/9b68ce2856dadc0e1cb6fd21fbeb850da49efd08 https://git.kernel.org/stable/c/91b9548d413fda488ea853cd1b9f59b572db3a0c https://git.kernel.org/stable/c/b4403cee6400c5f679e9c4a82b91d61aa961eccf