A race condition between hugetlb sysctl handlers in mm/hugetlb.c in the Linux kernel before 5.8.8 could be used by local attackers to corrupt memory, cause a NULL pointer dereference, or possibly have unspecified other impact, aka CID-17743798d812.
https://usn.ubuntu.com/4579-1/
https://usn.ubuntu.com/4576-1/
https://twitter.com/grsecurity/status/1303749848898904067
https://security.netapp.com/advisory/ntap-20201009-0002/
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.8