CVE-2021-21781

Aliases:UBUNTU-CVE-2021-21781DEBIAN-CVE-2021-21781
Advisory lineage Upstream: 0 Downstream: 16
Modified
Published: 18 Aug 2021, 14:37
Last modified:03 Aug 2024, 18:23

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
4 MEDIUM
v3.0 (cve.org)
EPSS Score
0.5% LOW
0% probability +0.48%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

18 Aug 2021, 14:37
Published
Vulnerability first disclosed
03 Aug 2024, 18:23
Last Modified
Vulnerability information updated

Description

An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11

CVSS Metrics

  • v3.1•LOW•Score: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
  • v3.0•MEDIUM•Score: 4CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  • v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 0.50%• Percentile: 42%

Techniques & Countermeasures

  • CWE-908•Use of Uninitialized Resource

    The product uses or accesses a resource that has not been initialized.

Affected Systems

  • debian•linux

    < 5.10.19-1 | < 5.10.19-1 | < 5.10.19-1 | < 5.10.19-1

  • ubuntu•linux

    all | < 4.15.0-143.147 | < 5.4.0-71.79

  • ubuntu•linux-aws

    all | < 4.15.0-1102.109 | < 5.4.0-1043.45

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1043.45~18.04.1

  • ubuntu•linux-aws-fips

    < 4.15.0-2044.46 | all | < 5.4.0-1069.73+fips2

  • ubuntu•linux-aws-hwe

    < 4.15.0-1102.109~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1114.127~14.04.1 | < 4.15.0-1114.127~16.04.1 | all | < 5.4.0-1044.46

  • ubuntu•linux-azure-4.15

    < 4.15.0-1114.127

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    < 5.4.0-1044.46~18.04.1

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fips

    < 4.15.0-2026.29 | all | < 5.4.0-1073.76+fips1

  • ubuntu•linux-bluefield

    all

  • ubuntu•linux-dell300x

    < 4.15.0-1018.22

  • ubuntu•linux-fips

    all | < 4.15.0-1059.67

  • ubuntu•linux-gcp

    < 4.15.0-1099.112~16.04.1 | all | < 5.4.0-1041.44

  • ubuntu•linux-gcp-4.15

    < 4.15.0-1099.112

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1041.44~18.04.1

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-gcp-fips

    all | < 5.4.0-1067.71~20.04.1

  • ubuntu•linux-gke

    < 5.4.0-1041.43

  • ubuntu•linux-gke-4.15

    all

  • ubuntu•linux-gke-5.4

    < 5.4.0-1040.42~18.04.1

  • ubuntu•linux-gkeop

    < 5.4.0-1013.14

  • ubuntu•linux-gkeop-5.4

    < 5.4.0-1013.14~18.04.1

  • ubuntu•linux-hwe

    < 4.15.0-143.147~16.04.3 | all

  • ubuntu•linux-hwe-5.4

    < 5.4.0-71.79~18.04.1

  • ubuntu•linux-hwe-5.8

    < 5.8.0-53.60~20.04.1

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    all | < 4.15.0-1091.93 | < 5.4.0-1037.38

  • ubuntu•linux-lts-xenial

    all

  • ubuntu•linux-oem

    all

  • ubuntu•linux-oem-5.10

    < 5.10.0-1017.18

  • ubuntu•linux-oem-5.6

    all

  • ubuntu•linux-oracle

    < 4.15.0-1071.79~16.04.1 | < 4.15.0-1071.79 | < 5.4.0-1042.45

  • ubuntu•linux-oracle-5.0

    all

  • ubuntu•linux-oracle-5.3

    all

  • ubuntu•linux-oracle-5.4

    < 5.4.0-1042.45~18.04.1

  • ubuntu•linux-raspi

    < 5.4.0-1033.36

  • ubuntu•linux-raspi-5.4

    < 5.4.0-1033.36~18.04.1

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.15.0-1085.90 | all

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    all

  • ubuntu•linux-riscv-5.8

    < 5.8.0-25.27~20.04.1

  • ubuntu•linux-snapdragon

    < 4.15.0-1102.111

Showing first 50 affected entries in server-rendered view.

References (6)