CVE-2020-25212
kernel: TOCTOU mismatch in the NFS client code
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 9, 2020
Updated · June 28, 2026
Description
A flaw was found in the NFSv4 implementation where when mounting a remote attacker controlled server it could return specially crafted response allow for local memory corruption and possibly privilege escalation.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
While there is no known mitigation to this flaw, configuring authentication and only mounting authenticated NFSv4 servers will significantly reduce the risk of this flaw being successfully exploited.
CVSS / CWE
CVSS 3.1 · 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition