kernel drivers before version 4.17-rc1 are vulnerable to a weakness in the Linux kernel's implementation of random seed data. Programs, early in the boot sequence, could use the data allocated for the seed before it was sufficiently generated.
https://www.debian.org/security/2018/dsa-4188
https://usn.ubuntu.com/3752-3/
https://usn.ubuntu.com/3752-2/
https://usn.ubuntu.com/3752-1/
https://usn.ubuntu.com/3718-2/
https://usn.ubuntu.com/3718-1/
https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html