CVE-2025-68803
Description
A flaw was found in the Linux kernel's NFSv4 server implementation. When an NFSv4 client creates a file and specifies an ACL with named principals, the server fails to apply the requested ACL. The nfsd_create_setattr() function checks only for iattr changes and security labels but not POSIX ACLs, causing the ACL to be silently dropped. The file ends up with a default ACL based on mode bits instead of the client-specified ACL, violating RFC 8881.
Statement
This is a functional bug that causes NFSv4 ACLs to not be applied during file creation. While it affects access control expectations, the default mode-based permissions are still applied. The impact is that files may have more permissive or restrictive access than intended by the client-specified ACL. This primarily affects environments relying on named principal ACLs for fine-grained access control.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | 8 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | Required |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Frequently Asked Questions
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