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01 Record

CVE-2021-3981

A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low

UnratedPUBLISHEDCNA: redhat
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 Description

A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.31% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 24.6% of scored records. A rank, not a probability.
NVD base score
3.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2022-03-08 14:02Z4 YR AGO
Last updated
2025-02-13 16:28Z1 YR AGO
Reserved
2021-11-19
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-276Incorrect Default PermissionsBase
Data version
5.1
Document digest
574f86eacab6b9e9fa4503504e9fb27415faebf87eaec951c8b88f2f7109b18d

05 Affected products

VendorProductVersionsPlatforms
n/agrub2grub2 2.06 and previous versions—

06 References

07 Fixed in

AlmaLinux 8

  • grub2-common
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-aa64
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-aa64-cdboot
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-aa64-modules
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-ia32
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-ia32-cdboot
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-ia32-modules
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-x64
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-x64-cdboot
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-x64-modules
    Fixed in 1:2.02-123.el8.alma
  • grub2-pc
    Fixed in 1:2.02-123.el8.alma
  • grub2-pc-modules
    Fixed in 1:2.02-123.el8.alma
  • grub2-ppc64le
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-ppc64le-modules
    Fixed in 1:2.02-123.el8.alma
  • grub2-tools
    Fixed in 1:2.02-123.el8.alma
  • grub2-tools-efi
    Fixed in 1:2.02-123.el8.alma
  • grub2-tools-extra
    Fixed in 1:2.02-123.el8.alma
  • grub2-tools-minimal
    Fixed in 1:2.02-123.el8.alma

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • grub2-common
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-aa64
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-aa64-cdboot
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-aa64-modules
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-ia32
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-ia32-cdboot
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-ia32-modules
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-x64
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-x64-cdboot
    Fixed in 1:2.02-123.el8.alma
  • grub2-efi-x64-modules
    Fixed in 1:2.02-123.el8.alma
  • grub2-pc
    Fixed in 1:2.02-123.el8.alma
  • grub2-pc-modules
    Fixed in 1:2.02-123.el8.alma
  • grub2-ppc64le
    Fixed in 1:2.02-123.el8_6.8.alma
  • grub2-ppc64le-modules
    Fixed in 1:2.02-123.el8.alma
  • grub2-tools
    Fixed in 1:2.02-123.el8.alma
  • grub2-tools-efi
    Fixed in 1:2.02-123.el8.alma
  • grub2-tools-extra
    Fixed in 1:2.02-123.el8.alma
  • grub2-tools-minimal
    Fixed in 1:2.02-123.el8.alma

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • grub2
    Fixed in 2.06-8

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • grub2
    Fixed in 2.06-8

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • grub2
    Fixed in 2.06-8

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • grub2-signed
    No fix yet
  • grub2-unsigned
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • grub2-signed
    No fix yet
  • grub2-unsigned
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • grub2-signed
    Fixed in 1.187.3~20.04.1
  • grub2-unsigned
    Fixed in 2.06-2ubuntu14.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • grub2-signed
    Fixed in 1.187.3~22.04.1
  • grub2-unsigned
    Fixed in 2.06-2ubuntu14.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

  • grub2-signed
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.