Is there a new version of the Errata document? The one the website (Doc ID 027036) is revision 1 and was released on 20-Oct-2014.
Why do I ask? The STM32F412 - has an Errata about DMA2 corruption when managing AHB and APB2 peripherals and I'm wondering if the STM32F411 has the same issue. IIRC, the STM32F410 has the same errata.
For what it is worth, the STM32F412 errata, Doc ID 027846, is on revision 6!