CVE-2025-68764
Description
A security bypass vulnerability was found in the Linux kernel's NFS client implementation. When a filesystem is automounted, user-specified security-related mount flags such as "ro" (read-only), "noexec" (no execution), "nodev" (no device files), and "sync" are not properly inherited by the automounted filesystem. This allows operations that should be restricted by the parent mount options.
Statement
This vulnerability allows bypassing mount security restrictions on NFS automounted filesystems. An attacker with access to an automounted NFS share could potentially execute binaries or write files when the parent mount was configured to prevent such actions. The impact depends on the specific mount flags used and what content is available on the NFS share.
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 | 6.1 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | None | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Access Control
Technical Impact: Gain Privileges or Assume Identity
A user can access restricted functionality and/or sensitive information that may include administrative functionality and user accounts.
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