CVE-2025-40326

kernel: NFSD: Define actions for the new time_deleg FATTR4 attributes

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · December 8, 2025

Updated · July 30, 2026

Description

A denial of service vulnerability was found in the NFS server (NFSD) in the Linux kernel. The server lacks handlers for the new time_deleg FATTR4 attributes introduced in RFC 9754. If a client sends a GETATTR request for these attributes, NFSD crashes instead of returning an appropriate error.

Statement

NFSv4 clients should not send GETATTR for these attributes per the specification, so only malicious or non-compliant clients would trigger this. The fix returns nfserr_inval for such requests.

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

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-1287 · Improper Validation of Specified Type of Input