CVE-2021-47316

Public on

Last Modified: UTC

Description

A vulnerability was found in the nfs3svc_encode_getaclres function in the Linux kernel's NFS server, where the function may encounter a NULL pointer for a directory entry (dentry), which can lead to a system crash or instability when accessed improperly.

A vulnerability was found in the nfs3svc_encode_getaclres function in the Linux kernel's NFS server, where the function may encounter a NULL pointer for a directory entry (dentry), which can lead to a system crash or instability when accessed improperly.

Statement

This vulnerability is rated as a moderate severity because it does not allow unauthorized access, but can cause a NULL dereference that may crash the NFS service, disrupting file system operations.

This vulnerability is rated as a moderate severity because it does not allow unauthorized access, but can cause a NULL dereference that may crash the NFS service, disrupting file system operations.

Mitigation

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.

Additional information

  • Bugzilla 2282464: kernel: nfsd: fix NULL dereference in nfs3svc_encode_getaclres
  • CWE-476: NULL Pointer Dereference
  • FAQ: Frequently asked questions about CVE-2021-47316

Common Vulnerability Scoring System (CVSS) Score Details

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 HatNVD

CVSS v3 Base Score

5.5

5.5

Attack Vector

Local

Local

Attack Complexity

Low

Low

Privileges Required

Low

Low

User Interaction

None

None

Scope

Unchanged

Unchanged

Confidentiality Impact

None

None

Integrity Impact

None

None

Availability Impact

High

High

CVSS v3 Vector

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

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

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?

What can I do if my product is listed as "Will not fix"?

What can I do if my product is listed as "Fix deferred"?

What is a mitigation?

I have a Red Hat product but it is not in the above list, is it affected?

Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?

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