CVE-2020-25212: Canonical Ubuntu Linux

High severity, CVSS 7.0. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 20.04 only
• Debian Debian Linux: version 9.0 only
• Linux Linux Kernel: before 5.8.3 (fixed in 5.8.3)
• Opensuse Leap: version 15.1 only; version 15.2 only

Published 2020-09-09. Last modified 2026-06-17.