A TOCTOU mismatch in the NFS client code in the Linux kernel before 5.8.3 could be used by local attackers to corrupt memory or possibly have unspecified other impact because a size check is in fs/nfs/nfs4proc.c instead of fs/nfs/nfs4xdr.c, aka CID-b4487b935452.
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.3
https://twitter.com/grsecurity/status/1303370421958578179
https://usn.ubuntu.com/4527-1/
https://usn.ubuntu.com/4525-1/
https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html
https://usn.ubuntu.com/4578-1/
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
Source: MITRE
Published: 2020-09-09
Updated: 2022-04-28
Type: CWE-787
Base Score: 4.4
Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 3.4
Severity: MEDIUM
Base Score: 7
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1
Severity: HIGH