In the Linux kernel, the following vulnerability has been resolved:

pds core: quiesce DMA before freeing resources

pdsc teardown() frees DMA buffers but does not disable bus mastering, leaving the device able to perform DMA after the buffers are freed. This can lead to use-after-free if the device writes to freed memory.

Add pci clear master() to pdsc teardown() to disable bus mastering before freeing resources, ensuring all DMA is quiesced.

Add pci set master() to pdsc setup() to re-enable bus mastering, which is needed for the firmware recovery path since pdsc teardown() now disables it.