A memory leak flaw was found in the Linux kernel’s DMA subsystem, in the way a user calls DMA_FROM_DEVICE. This flaw allows a local user to read random memory from the kernel space.
https://www.debian.org/security/2022/dsa-5173
https://www.debian.org/security/2022/dsa-5161
https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html