CVE-2021-20239

Aliases:UBUNTU-CVE-2021-20239DEBIAN-CVE-2021-20239
Advisory lineage Upstream: 0 Downstream: 6
Modified
Published: 28 May 2021, 10:42
Last modified:03 Aug 2024, 17:37

Vulnerability Summary

Overall Risk (default)
low
13/100
CVSS Score
3.3 LOW
v3.1 (nvd)
EPSS Score
0.26% LOW
0% probability +0.17%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

28 May 2021, 10:42
Published
Vulnerability first disclosed
03 Aug 2024, 17:37
Last Modified
Vulnerability information updated

Description

A flaw was found in the Linux kernel in versions before 5.4.92 in the BPF protocol. This flaw allows an attacker with a local account to leak information about kernel internal addresses. The highest threat from this vulnerability is to confidentiality.

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
  • v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:P/I:N/A:N

EPSS Trends

Current EPSS score: 0.26%• Percentile: 17%

Techniques & Countermeasures

  • CWE-822•Untrusted Pointer Dereference

    The product obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.

  • CWE-119•Improper Restriction of Operations within the Bounds of a Memory Buffer

    The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Affected Systems

  • debian•linux

    < 5.10.4-1 | < 5.10.4-1 | < 5.10.4-1 | < 5.10.4-1

  • ubuntu•linux

    < 5.4.0-67.75

  • ubuntu•linux-aws

    < 5.4.0-1039.41

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1039.41~18.04.1

  • ubuntu•linux-aws-fips

    < 5.4.0-1069.73+fips2 | all

  • ubuntu•linux-azure

    all | < 5.4.0-1041.43

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    < 5.4.0-1041.43~18.04.1

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fips

    < 5.4.0-1073.76+fips1 | all

  • ubuntu•linux-bluefield

    all

  • ubuntu•linux-gcp

    all | < 5.4.0-1038.41

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1038.41~18.04.1

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-gcp-fips

    < 5.4.0-1067.71~20.04.1 | all

  • ubuntu•linux-gke

    < 5.4.0-1037.39

  • ubuntu•linux-gke-4.15

    all

  • ubuntu•linux-gke-5.4

    < 5.4.0-1037.39~18.04.1

  • ubuntu•linux-gkeop

    < 5.4.0-1011.12

  • ubuntu•linux-gkeop-5.4

    < 5.4.0-1011.12~18.04.2

  • ubuntu•linux-hwe

    all

  • ubuntu•linux-hwe-5.4

    < 5.4.0-67.75~18.04.1

  • ubuntu•linux-hwe-5.8

    < 5.8.0-49.55~20.04.1

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    < 5.4.0-1034.35

  • ubuntu•linux-oem

    all

  • ubuntu•linux-oem-5.6

    < 5.6.0-1050.54

  • ubuntu•linux-oracle

    < 5.4.0-1039.42

  • ubuntu•linux-oracle-5.0

    all

  • ubuntu•linux-oracle-5.3

    all

  • ubuntu•linux-oracle-5.4

    < 5.4.0-1039.42~18.04.1

  • ubuntu•linux-raspi

    < 5.4.0-1030.33

  • ubuntu•linux-raspi-5.4

    < 5.4.0-1030.33~18.04.1

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    all

  • ubuntu•linux-realtime

    all

  • ubuntu•linux-riscv

    all

  • ubuntu•linux-riscv-5.8

    < 5.8.0-22.24~20.04.1

  • fedoraproject•fedora

    33

  • linux•linux_kernel

    < 5.4.92

  • redhat•enterprise_linux

    5.0 | 6.0 | 8.0

References (8)