UBUNTU-CVE-2021-33656

Advisory lineage Upstream: 1 Downstream: 15
Upstream
CVE-2021-33656
Published: 18 Jul 2022, 15:15
Last modified:04 Jul 2026, 19:20

Vulnerability Summary

Overall Risk (default)
medium
27/100
CVSS Score
6.8 MEDIUM
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

18 Jul 2022, 15:15
Published
Vulnerability first disclosed
04 Jul 2026, 19:20
Last Modified
Vulnerability information updated

Description

When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.8CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Systems

  • ubuntu•linux

    all | < 4.4.0-234.268 | < 4.15.0-192.203 | < 5.4.0-125.141

  • ubuntu•linux-aws

    < 4.4.0-1113.119 | < 4.4.0-1150.165 | < 4.15.0-1140.151 | < 5.4.0-1084.91

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.11

    all

  • ubuntu•linux-aws-5.13

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1084.91~18.04.1

  • ubuntu•linux-aws-5.8

    all

  • ubuntu•linux-aws-fips

    < 4.15.0-2079.84 | all | < 5.4.0-1085.92+fips1

  • ubuntu•linux-aws-hwe

    < 4.15.0-1140.151~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1150.165~14.04.1 | < 4.15.0-1150.165~16.04.1 | all | < 5.4.0-1090.95

  • ubuntu•linux-azure-4.15

    < 4.15.0-1150.165

  • ubuntu•linux-azure-5.11

    all

  • ubuntu•linux-azure-5.13

    all

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    < 5.4.0-1090.95~18.04.1

  • ubuntu•linux-azure-5.8

    all

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde-5.15

    all | < 5.15.0-1114.123~20.04.1

  • ubuntu•linux-azure-fips

    < 4.15.0-2060.66 | all | < 5.4.0-1090.95+fips1

  • ubuntu•linux-bluefield

    < 5.4.0-1045.50 | all

  • ubuntu•linux-dell300x

    < 4.15.0-1052.57

  • ubuntu•linux-fips

    < 4.4.0-1083.90 | all | < 4.15.0-1097.108 | < 5.4.0-1060.68

  • ubuntu•linux-gcp

    < 4.15.0-1135.151~16.04.2 | all | < 5.4.0-1087.95

  • ubuntu•linux-gcp-4.15

    < 4.15.0-1135.151

  • ubuntu•linux-gcp-5.11

    all

  • ubuntu•linux-gcp-5.13

    all

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1087.95~18.04.1

  • ubuntu•linux-gcp-5.8

    all

  • ubuntu•linux-gcp-fips

    < 4.15.0-2044.49 | all | < 5.4.0-1087.95+fips1

  • ubuntu•linux-gke

    < 5.4.0-1081.87

  • ubuntu•linux-gke-4.15

    all

  • ubuntu•linux-gke-5.4

    all

  • ubuntu•linux-gkeop

    < 5.4.0-1052.55

  • ubuntu•linux-gkeop-5.4

    all

  • ubuntu•linux-hwe

    < 4.15.0-192.203~16.04.1 | all

  • ubuntu•linux-hwe-5.11

    all

  • ubuntu•linux-hwe-5.13

    all

  • ubuntu•linux-hwe-5.4

    < 5.4.0-125.141~18.04.1

  • ubuntu•linux-hwe-5.8

    all

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-ibm

    < 5.4.0-1032.36

  • ubuntu•linux-ibm-5.4

    < 5.4.0-1032.36~18.04.1

  • ubuntu•linux-intel-5.13

    all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-iot

    < 5.4.0-1004.6

  • ubuntu•linux-kvm

    < 4.4.0-1114.124 | < 4.15.0-1126.131 | < 5.4.0-1074.79

  • ubuntu•linux-lts-xenial

    < 4.4.0-234.268~14.04.1

  • ubuntu•linux-nvidia

    all

Showing first 50 affected entries in server-rendered view.

References (18)