It was found that the net_dma code in tcp_recvmsg() in the 2.6.32 kernel as shipped in RHEL6 is thread-unsafe. So an unprivileged multi-threaded userspace application calling recvmsg() for the same network socket in parallel executed on ioatdma-enabled hardware with net_dma enabled can leak the memory, crash the host leading to a denial-of-service or cause a random memory corruption.
The Linux kernel is prone to a local memory-corruption vulnerability. Attackers can exploit this issue to obtain sensitive information or crash the application resulting in a denial-of-service condition.
Updates are available. Please see the references or vendor advisory for more information.
Currently, we are not aware of any working exploits.